Malicious PDF — malware analysis report

Static analysis result for SHA-256 2770293fe0d5eef7…

MALICIOUS

PDF

68.0 KB Created: 2020-12-06 09:51:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e13bf34adcb1dfc2fe501163937265ae SHA-1: dd40030ea45122534978cda50d9e5bbb2ea29a6e SHA-256: 2770293fe0d5eef779cc4d15085927aa8785f6b4580736e2269ddd3caae92d71
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 0.9997

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://trafffi.ru/strik?utm_term=conceptos+de+ecologia+kormondy+pdf PDF link annotation
    • https://wetolobumusu.weebly.com/uploads/1/3/4/5/134579125/97438d99859.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/pegefidokoxim_wobofebiwepulaw.pdfIn PDF document text
    • https://solujokorox.weebly.com/uploads/1/3/4/1/134108712/2957965.pdfIn PDF document text
    • https://pikupazu.weebly.com/uploads/1/3/4/5/134577858/1dcb1a870730.pdfIn PDF document text
    • https://saxuvelimeno.weebly.com/uploads/1/3/4/4/134480096/pagasusufuwigu.pdfIn PDF document text
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/pobaxaxosaxuvi.pdfIn PDF document text
    • https://xigokerurubupa.weebly.com/uploads/1/3/4/3/134312623/rofepuzod.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/4089871.pdfIn PDF document text
    • https://dafanifupo.weebly.com/uploads/1/3/4/6/134645493/wiker-nexidububorak-sumamut.pdfIn PDF document text
    • https://virekapowop.weebly.com/uploads/1/3/4/0/134013047/kejarumuperodo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/suzeduselu/survival_hunter_pvp_guide_8.2.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3603616f6d44b07ce7d72/t/5fc3e9f29ee0f32b87cc2dad/1606674930560/jirotagigozofokad.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/al_quran_16_lines_tajweed.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_off0000cc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC91 5544 bytes
SHA-256: db4e086452fe8d9978b01689f1fbf8e5f42407b2b3c10d72195b2c0255ec26ae
font_01_sfnt_off0000df65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 10836 bytes
SHA-256: 610d08165ad70715cedd29ceaf6c4efcf5bddd9e215f27aaeca1e2dbc439aa97

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