Malicious PDF — malware analysis report

Static analysis result for SHA-256 191bb987c8ea97d3…

MALICIOUS

PDF

79.2 KB Created: 2021-06-01 02:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c851b6b8eb33fa269a37632c758e9417 SHA-1: 2f48ee7f7305c3039a3ef2e7f0cd2fb8eca9858d SHA-256: 191bb987c8ea97d3b2bc06ace801b369e9951a61c8603d453d33a0d30544473e
206 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. It uses a callback-phone (TOAD) lure. 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 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jacksth.ru/123?utm_term=georgetown+score+reporting PDF link annotation
    • https://mugunerer.weebly.com/uploads/1/3/4/4/134479547/5119328.pdfIn PDF document text
    • https://pimujupaz.weebly.com/uploads/1/3/4/4/134440235/zozifo.pdfIn PDF document text
    • https://jenifamizoj.weebly.com/uploads/1/3/5/3/135319667/9985f.pdfIn PDF document text
    • https://vosuxawa.weebly.com/uploads/1/3/1/1/131164537/f8dd6e13.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4402722/normal_60b5601ecd6a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414489/normal_60078d0e397da.pdfIn PDF document text
    • https://nabivedoki.weebly.com/uploads/1/3/1/4/131407492/ximekipolefenekolud.pdfIn PDF document text
    • https://bevokelas.weebly.com/uploads/1/3/4/3/134310014/rukiwasusuvazov_kubutud_marunujurajoxab_kuvubarisamo.pdfIn PDF document text
    • https://xixutusolorul.weebly.com/uploads/1/3/4/6/134685478/miduka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zabodovojif.pbworks.com/w/file/fetch/144426162/lukeref.pdfIn PDF document text
    • http://mikabipi.pbworks.com/w/file/fetch/144433104/lusufonalilipotamefogipi.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/38943789680.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/f/93564114576.pdfIn PDF document text
    • http://mepijewaj.pbworks.com/w/file/fetch/144426699/batutuzerogojide.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144428055/how_to_test_insulation_resistance_of_a_transformer.pdfIn PDF document text
    • http://paderukut.pbworks.com/w/file/fetch/144432486/lonejipozupul.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144426855/gta_san_andreas_cleo_mod_apk_v2.00.pdfIn PDF document text
    • http://fisukafetif.pbworks.com/w/file/fetch/144419037/raven_cruizer_ii_price.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/vesegili.pdfIn PDF document text
    • http://venatulafiz.pbworks.com/f/enrichment_worksheet_120_chapter_30_answers.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_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 4984 bytes
SHA-256: 6658dceff7b123860a0cd1159bcb46e99827052f6878dd20061818604b9b99fd
font_01_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 11272 bytes
SHA-256: cc0effe567397b7ac6efcbb7e2bf1a7d489cf6a3e11ae7aaf0b9f20003e19705