Malicious PDF — malware analysis report

Static analysis result for SHA-256 5420f1fa77d482b8…

MALICIOUS

PDF

87.5 KB Created: 2021-03-06 02:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e5050f55a38a0b8c956a833e77fa87e8 SHA-1: 8513724a6ba675dae71da6915898ebe55601114c SHA-256: 5420f1fa77d482b8560b5b055e0bf09a81055060e788c540d94f0a324b957f03
126 Risk Score

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 0.9993

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://soxebez.ru/123?utm_term=bhagwat+geeta+saar+in+hindi+audio PDF link annotation
    • http://pokezokebawi.mygamesonline.org/24470623681.pdfIn PDF document text
    • http://kakasusalulul.iblogger.org/38971093038.pdfIn PDF document text
    • http://kebenoda.scienceontheweb.net/koxujesuju.pdfIn PDF document text
    • http://lakulikelanu.iblogger.org/sivodudixetunirogiga.pdfIn PDF document text
    • http://zomaragexavope.sportsontheweb.net/what_caused_second_great_awakening.pdfIn PDF document text
    • http://wimuzawoxi.getenjoyment.net/saraporojalezin.pdfIn PDF document text
    • http://pezidibega.iblogger.org/83964241214.pdfIn PDF document text
    • http://vafakewa.iblogger.org/cd_siz_format_atma_windows_8.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/metodologia_de_la_investigacion_cientifica_hernandez_sampieri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://kosuvoz.epizy.com/fraser_river_sturgeon_guides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5754ee50-dcba-42f6-b7e1-d55eac885d7f/how_much_does_a_waterpik_water_flosser_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd084b0f-e1ec-404b-a264-1ebf249bedab/79736993049.pdfIn PDF document text
    • http://telosizaba.onlinewebshop.net/48025271281.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/pronoms_relatifs_qui_que_dont_exercices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83b42e28-20f0-44bc-8f9d-61ffde828ea3/nonlinear_dynamics_and_chaos_2nd_edition.pdfIn PDF document text
    • http://jemileti.atwebpages.com/29704857272.pdfIn PDF document text
    • http://vupifokixen.rf.gd/subinefibiket.pdfIn PDF document text
    • http://koradanizepagow.myartsonline.com/veg_recipes_for_dinner_in_marathi.pdfIn PDF document text
    • http://vakisetituli.rf.gd/wobexarivakavuxeradesijur.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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB7 3104 bytes
SHA-256: 24551eddf735aab63d4c7e1e241f9f40a571c0286a9358847cb31cf4386de53e
font_01_sfnt_off0000e7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 5080 bytes
SHA-256: 236bb2ca166826cec9130f43d8d22fee571f09de75648cb609d1bb5e4aeb3c36
font_02_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 10344 bytes
SHA-256: b0498b421b6b447ce1d5c0058d96280d8c0d46c850dfc9607b8f58956ffe9f3b
font_03_sfnt_off00011cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC0 16604 bytes
SHA-256: 425eaf75a1137064852c1403ea4d2b924c5fbe4aea03536e4b2cc2676fa3b282
font_04_sfnt_off000133af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AF 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
font_05_sfnt_off000141af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AF 3228 bytes
SHA-256: 678ac5974a8bab43ac2857fb41dd3349928c3a53e4e94addbad0fadaa5016d8a