Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60bbca75ff4b1eb…

MALICIOUS

PDF

75.7 KB Created: 2021-06-09 18:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 60f4c09407f037ca9a1529b094f9595f SHA-1: 23319392592ddcba2f44ce29ff08545354aef16e SHA-256: b60bbca75ff4b1eb34f18cf48e2801172e44423282b2cc19adaf12ac0d7c1138
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 0.9996

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://laborke.ru/pbw?utm_term=free+music+download+app+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392649/normal_6060f005e24f1.pdfIn PDF document text
    • https://nezogifoxo.weebly.com/uploads/1/3/1/6/131637357/xijerotiwesula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421781/normal_5fccd23d2d22d.pdfIn PDF document text
    • https://fewegako.weebly.com/uploads/1/3/1/4/131453302/firapuval-wulusuvusejode-liten-bapakupagawegif.pdfIn PDF document text
    • https://bazapefonufoteb.weebly.com/uploads/1/3/4/6/134637130/kilebu.pdfIn PDF document text
    • https://barezixajeg.weebly.com/uploads/1/3/4/3/134318527/4792890.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366371/normal_600235d6f399e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_60571dc223d44.pdfIn PDF document text
    • https://mitiguranam.weebly.com/uploads/1/3/4/4/134456526/01e676eb78e65bf.pdfIn PDF document text
    • https://girezerel.weebly.com/uploads/1/3/1/0/131070389/lenodujavuligi.pdfIn PDF document text
    • https://zofijakifixanow.weebly.com/uploads/1/3/4/6/134677560/57b4ec922908095.pdfIn PDF document text
    • https://wilexezixokesu.weebly.com/uploads/1/3/4/7/134764798/84fde1a6623ac.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/3591134.pdfIn PDF document text
    • https://joluduloj.weebly.com/uploads/1/3/4/2/134266967/mivawaguxasowemexiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c913475e-1870-42f8-bf5f-0cbc71a1d6a3/80091539460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6b79db4-36fe-4ba9-a9cf-be4e98fc82ad/hp_laserjet_pro_400_mfp_m475dn_drivers.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/w/file/fetch/144627942/kidde_smoke_alarm_model_1275_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6c1307-de5a-49f1-bbef-bc8986478213/pine_sol_kill_fungus.pdfIn PDF document text
    • http://vomokig.pbworks.com/f/81032193369.pdfIn PDF document text
    • http://xiwitanul.pbworks.com/f/shakes_and_fidget_pet_lvl_guide.pdfIn PDF document text
    • http://wurutaw.pbworks.com/f/xojunivir.pdfIn PDF document text
    • http://legalugo.pbworks.com/f/harry_potter_and_the_cursed_child_free_download.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 5332 bytes
SHA-256: 79828c793c39b7eb31e97163f69e23b517f3bf4ec3cd25d1dd2aa4619a613cbb
font_01_sfnt_off0000fcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF2 10272 bytes
SHA-256: 58032a20484eac6b9450e1df5109a3fa89a066f381425ea595b2d7022d776d92