Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d5b3ab68c1ae12…

MALICIOUS

PDF

72.0 KB Created: 2021-05-19 03:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 106994bd9b607d142d69b4aa062bd7d9 SHA-1: d98e7f92695f86de55a50868c4f6e4b0ba369474 SHA-256: 77d5b3ab68c1ae12fe303869eb239843e346858a90da0808326b203b61f01e8b
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 0.9991

Heuristics 6

  • 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.
  • 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://bologen.ru/strik?utm_term=fast+and+furious+1+full+movie+download+mp4+in+hindi+dubbed+480p PDF link annotation
    • https://bepupoxusiboma.weebly.com/uploads/1/3/4/8/134847186/ac8f85c9492dc.pdfIn PDF document text
    • https://tikigafose.weebly.com/uploads/1/3/0/8/130874564/rejeviwisuma.pdfIn PDF document text
    • https://dipalowijoje.weebly.com/uploads/1/3/0/9/130969855/lirizoxilev_tebuxo_luxuzisopuvu_narolivevabaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411915/normal_5fecf8ad22a32.pdfIn PDF document text
    • https://gufurokis.weebly.com/uploads/1/3/1/4/131453316/tegunamozar-kekizazi-nijilafobixi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414515/normal_5fd8865c5ac32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372080/normal_602622a39a362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449774/normal_601853b342c64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462037/normal_5fdc7d79edc0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_600ff32aa1ea9.pdfIn PDF document text
    • https://debovibeki.weebly.com/uploads/1/3/4/7/134715081/9558617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_602fd22b19aba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379371/normal_601cb815004fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381340/normal_6004393d9649b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416496/normal_5ffbb6734c161.pdfIn PDF document text
    • https://sevivuninuk.weebly.com/uploads/1/3/4/4/134459749/novebi-rugokus-pufozat.pdfIn PDF document text
    • https://kopojari.weebly.com/uploads/1/3/4/5/134585935/934846.pdfIn PDF document text
    • https://xasedomag.weebly.com/uploads/1/3/1/0/131071243/vanuxavuzasodozozuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tikinupuworate.rf.gd/jewish_apocalyptic_literature.pdfIn PDF document text
    • http://burijudipo.epizy.com/stephen_king_christine_first_edition.pdfIn PDF document text
    • http://kizilobizewepog.epizy.com/ranokipodasubimidepope.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/genetaruvonexexif.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/commission_sales_contract_template_free.pdfIn PDF document text
    • http://vepilezora.epizy.com/missguided_promo_code_ireland.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/97079900240.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_off0000da55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA55 6004 bytes
SHA-256: 2aa29a6185ea23b12220b724596863b429d00ce719ebb6c206ef4091fc833e90
font_01_sfnt_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 10204 bytes
SHA-256: bde122bbd2c5383235964dc2abc884bdc47ec4d6191852c0a9e0690fc71399f4