Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5db3ae4fcb92491…

MALICIOUS

PDF

104.8 KB Created: 2021-04-02 13:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3d4279bc6ffe5d8fb88dcbbf9efab374 SHA-1: 8ff5e3f107317dfaa3515b6d23b1395c0f0184b9 SHA-256: f5db3ae4fcb924911b85317e8076efc35d4a2eabcf3bbce84ae5d408a12df8d8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/award?keyword=descargar+diccionario+biblico+certeza+pdf PDF link annotation
    • http://goldalbum.ru/dnd_dice_roller3nsvn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476436/normal_5fd2d82eb0531.pdfIn PDF document text
    • http://myshoes.moscow/where_to_buy_avon_skin_so_soft_bug_guardspp3s.pdfIn PDF document text
    • https://xuvelufuxilo.weebly.com/uploads/1/3/5/3/135387868/7137b5011fff01f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489045/normal_5ff97246ba90e.pdfIn PDF document text
    • https://wusezituvita.weebly.com/uploads/1/3/4/6/134608160/744675.pdfIn PDF document text
    • https://nusuxoxoli.weebly.com/uploads/1/3/2/7/132710665/38f2038dbff.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/bupudip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_601420a376a32.pdfIn PDF document text
    • http://tajeromodovo.66ghz.com/31959810685.pdfIn PDF document text
    • http://smartbright.club/united_nations_peacekeeping_missions_military_logistics_unit_manualjiije.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464083/normal_6002ecb1b5ee3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408343/normal_5ffff7b92c7c1.pdfIn PDF document text
    • https://kodugeji.weebly.com/uploads/1/3/6/0/136089350/wanexudasezil.pdfIn PDF document text
    • http://bupetud.xyz/ginekovuxesabozelulem91nge.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/1934604.pdfIn PDF document text
    • https://tejojixamabaje.weebly.com/uploads/1/3/2/7/132740549/jabedikij-biliwilapulov-bovepuzemavib.pdfIn PDF document text
    • http://wimobilo.iblogger.org/31470389155.pdfIn PDF document text
    • http://nicepics.xyz/45905127847c8p3p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488855/normal_5ff925a67a5fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489259/normal_6035551c20024.pdfIn PDF document text
    • https://cinurl.com/1i2a4aIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://kupikobu.epizy.com/wheel_of_time_book_1_free.pdfIn PDF document text
    • http://kedokonox.rf.gd/6.0_powerstroke_engine_for_sale_alberta.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DE 7268 bytes
SHA-256: 9a9b5c7011c0b022da1f231f937dabf36c90d545fb95ecd41b3c1ed575da42ca
font_01_sfnt_off000130f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F2 5512 bytes
SHA-256: d38d49a15b236cb17bd5288b1d35b92b4bbf811c9a8d5629b10efce3125c8c4a
font_02_sfnt_off000143bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143BF 4396 bytes
SHA-256: de95721b2b91689e754077c1004e5f7ed99d0dd4095740e74895e6055951e091
font_03_sfnt_off0001538d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1538D 12748 bytes
SHA-256: 9aec7de5e5a42478f45dba559d940156f1cfa6e38e774218b921c4060ec4cae8
font_04_sfnt_off00017d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D39 16188 bytes
SHA-256: dd05f3a199ad2d978bd173fb45b380c6689d243adb5b122b9a9c20315e0b6377