Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dfd4eff61335ed6…

MALICIOUS

PDF

85.6 KB Created: 2021-04-28 06:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 332e4de9ab907148f010841ca2ecf999 SHA-1: 170e25b382f05efdb764c3da0cf55c42ec064e4d SHA-256: 0dfd4eff61335ed678d81173449f4b57ce0c2c49c78ae826c59d0da0f294c64f
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://vilenefex.ru/strik?utm_term=in+what+order+should+i+watch+marvel PDF link annotation
    • https://zekaxuwamawebi.weebly.com/uploads/1/3/5/9/135961115/lutuvexom.pdfIn PDF document text
    • https://vovisomesosaza.weebly.com/uploads/1/3/4/4/134462399/kudufogiliwe_nefigelunune_duxadu_xorufubapim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416318/normal_6068f75151eea.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/f2fd75148cdc5a.pdfIn PDF document text
    • https://lexobazotukagof.weebly.com/uploads/1/3/1/4/131407042/fajizafa.pdfIn PDF document text
    • https://xajomorunineg.weebly.com/uploads/1/3/1/3/131383441/3b886298c1809c6.pdfIn PDF document text
    • https://wijuluvewez.weebly.com/uploads/1/3/1/4/131437378/metevatatum.pdfIn PDF document text
    • https://dirixiganud.weebly.com/uploads/1/3/4/3/134321978/7948684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479679/normal_6053e16c877e6.pdfIn PDF document text
    • https://dosidebeg.weebly.com/uploads/1/3/5/3/135318632/6243257.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
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_11815a3ca74545d681c4eb39717bd12e.pdf?index=trueIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_3f20539d5bd54d0d8579023a6821aac2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/xujesuvipesugeneg.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/kilibutesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/589031fe-0068-4ca6-bea1-fa212e60fdf4/how_to_remove_a_timex_ironman_watch_band.pdfIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_db34693b3101471cb467a6e729189e9d.pdf?index=trueIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_c9ff7d362d0d410db075d29db2d9e37c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c18b555b-1451-4915-9285-383ad212c345/fiwewebupeme.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/ejemplo_de_introduccion_con_normas_apa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 5148 bytes
SHA-256: 451216b41e7df1416dc07e9b58a75bf5e9852143eb80298f1a980fb0d8547c67
font_01_sfnt_off0001133a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133A 11800 bytes
SHA-256: 628a913b8594a622641b40f1b2d256dbc4e1e297577aaa4479a8b59f3682e4db
font_02_sfnt_off00013b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B28 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333