Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18ffbd0724d2920…

MALICIOUS

PDF

118.8 KB Created: 2021-03-19 11:59:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b02065a9b44b32f3291702a2d27f96f9 SHA-1: 9167c568491ccc21766850ea0b2b06e8d608a3f9 SHA-256: d18ffbd0724d2920080b3154becfaf145c63c641a1e77bcbb5640b32f127b106
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9723

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/wix?keyword=congruence+postulates+sss+asa+sas+aas+and+hl+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369632/normal_6014e3f7bc07a.pdfIn PDF document text
    • http://bestsalestoday.xyz/xorifunizebijiyrz9k.pdfIn PDF document text
    • http://antinomi.design/kixolewopevifenutew1qffo.pdfIn PDF document text
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/3896716.pdfIn PDF document text
    • http://webmastervlad.ru/51127629353yip0f.pdfIn PDF document text
    • https://kalizijowu.weebly.com/uploads/1/3/4/7/134733304/af0763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489263/normal_60297d9c7ccc0.pdfIn PDF document text
    • http://masuxokovofa.66ghz.com/55500923610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416327/normal_602115ac1c180.pdfIn PDF document text
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/kitubufet.pdfIn PDF document text
    • https://xakalawuvobovu.weebly.com/uploads/1/3/1/0/131071286/305700.pdfIn PDF document text
    • http://marketitaly.pro/change_region_samsung_smart_tv_7_seriesyvfqd.pdfIn PDF document text
    • http://com-signto2.xyz/how_many_spell_slots_do_clerics_have0fnv9.pdfIn PDF document text
    • http://torchland.xyz/10578647760m6zwl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479240/normal_6021483d9422d.pdfIn PDF document text
    • http://nuzimes.iblogger.org/34856818935.pdfIn PDF document text
    • http://ig-copyrightviolation.com/kotlik_weather_reporto5pjh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469633/normal_6003d7284a67e.pdfIn PDF document text
    • http://netewe9.xyz/gafotukimus1fu4y.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn PDF document text
    • http://luledajosa.epizy.com/wave_properties_and_math_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b594245d-f35a-47ad-afa0-26ee883de27b/what_happens_to_luna_in_harry_potter.pdfIn PDF document text
    • http://romipozaxijida.rf.gd/glencoe_world_history_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82db4c5e-d2b8-4258-a84f-fecdb3546ef0/95239748244.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00010d93.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10D93 6804 bytes
SHA-256: dd71a281344fe0e971d5f7c4c54355fb806f2db946e76ce7efde68c100771a76
stream_008_off00019320.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19320 18388 bytes
SHA-256: 67510d4acf3891ce9ea4a7c3ecabec5a51530f5d3f1dd54940bb32548ad95fa6
font_01_sfnt_off00011ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 4088 bytes
SHA-256: 087f7a5f04acd34c3f1124f6535c6982b8a8f953a4640d341636c7c7aaa2f0b1
font_02_sfnt_off00012ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE9 1600 bytes
SHA-256: 5639e697c8b40abaf0bc8d49e5013fa0b3aef1251dd84b28f5af4273b071f017
font_03_sfnt_off00013506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13506 5396 bytes
SHA-256: d135d0d935d238af396f7f9b11d30c4a73537decb7e58625bf0184c80bb7ba25
font_04_sfnt_off00014771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14771 9148 bytes
SHA-256: 1e40410bc9dc1fc1cd39fdc8a7e47174f3455396372c5319cd43e75d78c0d0c8
font_05_sfnt_off000159c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C9 17576 bytes
SHA-256: 8e437576e3c9279073764a4a2059d894ae71c2f9f3712876eeca6cd09109a922
font_07_sfnt_off0001b027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B027 2404 bytes
SHA-256: 0e8d83e0f68871f741a6c38331677be4b24cb6bb068a8e99b3f1b4625101e48b
font_08_sfnt_off0001ba06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA06 6328 bytes
SHA-256: 8c98e7771380d7f08cac77a39746b91608de37881ebb303337afa150ab456e0c

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