Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc9c6ffa0e52f68…

MALICIOUS

PDF

96.9 KB Created: 2021-05-05 10:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9306727d12d8092581b1e298aed806c8 SHA-1: d563488bee35f582fac8c80b9d1b156f01ec2a56 SHA-256: 8bc9c6ffa0e52f68e3020a0e35545426b56487e339b8c6fc7a0b7274824d3851
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=1984+champion+bass+boat+owners+manual PDF link annotation
    • https://soremezu.weebly.com/uploads/1/3/1/0/131070226/7824191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393028/normal_5ffddd0bab2a8.pdfIn PDF document text
    • https://cdn.sqhk.co/jalotenabo/hiWechd/rugofodazof.pdfIn PDF document text
    • https://cdn.sqhk.co/lunapolakezo/Ol3jehd/black_xmas_tree_with_lights.pdfIn PDF document text
    • https://ranitezal.weebly.com/uploads/1/3/1/4/131438109/wokopigeri_fumomutuvu_tidowubelozi.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/hhZhblt/blockys_eatery_loveland.pdfIn PDF document text
    • https://wikefazopikevi.weebly.com/uploads/1/3/4/7/134715570/munupolakejozonulafu.pdfIn PDF document text
    • http://praktika-ingenieur.com/what_does_a_crossover_cable_look_likelbpgx.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/ujaVjeu/emergency_siren_sounds.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/5aV3Dia/87310148630.pdfIn PDF document text
    • http://fineagencyy.com/medamuzadigemokasaps8kea.pdfIn PDF document text
    • https://vuvajufuzuno.weebly.com/uploads/1/3/4/4/134480129/446a4.pdfIn PDF document text
    • http://masalev.ru/doxop9k9u6.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/10708069687v3s97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379616/normal_5ffba4874637d.pdfIn PDF document text
    • https://cdn.sqhk.co/rekosiseweno/mqpgjjb/all_star_dunk_contest_2020_lineup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506063/normal_604fc459a0d36.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_10e7719cd85241d69fc77557a8651322.pdf?index=trueIn PDF document text
    • https://3796e7af-74f6-4269-b4b1-c98d6d9a2df3.filesusr.com/ugd/169b5e_2c80b149e8ab4d859cf2f6b0b4496a85.pdf?index=trueIn 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_off000136b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B2 5800 bytes
SHA-256: 14eff41f14eaafa89819705c27135e289e8355e5618c280185cf54d62dfa953e
font_01_sfnt_off00014a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A59 13252 bytes
SHA-256: 4dcaaf4ba276f79ee03e398f82432fba23a90d39dfcad31979fd7ca90599261e