Malicious PDF — malware analysis report

Static analysis result for SHA-256 79008095607a4063…

MALICIOUS

PDF

107.9 KB Created: 2021-03-19 13:08:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eed2b9df8650429de2c9bd878f5121fe SHA-1: b7272f7c9792479245912ab00aef48470aeae3b9 SHA-256: 79008095607a4063062f325fe93cd7b1bcc6380bd8d71d69c872df91d25f6d0a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, indicating it functions as a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent, with many links hosted on disposable domains. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://zajinet.ru/wix?keyword=audi+a1+manual+pdf PDF link annotation
    • https://marutonekuposew.weebly.com/uploads/1/3/1/6/131606360/gatujaxupogitexuzuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450249/normal_600497f99987d.pdfIn PDF document text
    • https://tirotirow.weebly.com/uploads/1/3/1/3/131380420/zogafun.pdfIn PDF document text
    • https://rukazoxet.weebly.com/uploads/1/3/4/0/134040508/xisusad.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/hcbggjf/54392171961.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448137/normal_5ff9ed6d58666.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/2gfjiuv/twin_pubg_mobile_gamepad_controller.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/iaighUf/jobajodotopenib.pdfIn PDF document text
    • https://labekefetimobu.weebly.com/uploads/1/3/0/7/130739294/dakovixetiwojo.pdfIn PDF document text
    • https://tixowofo.weebly.com/uploads/1/3/4/5/134592641/rixar.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwufeguv/hcNlRji/woodworking_classes_nyc.pdfIn PDF document text
    • https://benedelewerovil.weebly.com/uploads/1/3/1/3/131384674/5705694.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/ihjc3ie/74632200854.pdfIn PDF document text
    • https://zufulakoloti.weebly.com/uploads/1/3/5/3/135301661/nofesexor-velora-padotutorapil-rekamage.pdfIn PDF document text
    • https://lopuxewununoj.weebly.com/uploads/1/3/4/7/134748711/dimofewikeboma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388619/normal_60058d91c56bf.pdfIn PDF document text
    • https://lakiromepokina.weebly.com/uploads/1/3/4/5/134589127/8300885.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/nuwugeramupex.pdfIn PDF document text
    • https://cdn.sqhk.co/kosozezoxuxe/yjbhejh/53650257678.pdfIn PDF document text
    • https://feposogasutam.weebly.com/uploads/1/3/1/3/131384530/9580096.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500425/normal_5fef6ea6aa1a6.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/pjcdfjh/74229050461.pdfIn PDF document text
    • https://fototinuvanumef.weebly.com/uploads/1/3/1/4/131406749/xaxuzuwironifolobi.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwosexed/ekP46ic/child_care_aware_mn_regions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506200/normal_5fe5a652805d0.pdfIn PDF document text
    • https://logutidukikov.weebly.com/uploads/1/3/1/3/131380383/wusefavuguzokewaba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00015b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B95 4952 bytes
SHA-256: 5a49173f2eb874bb40b05187107ac4451509870f9ce8bea9d2424cfcf3824b35
font_01_sfnt_off00016c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C6D 16928 bytes
SHA-256: 3f6473224da570179eb946095b18fd58144a811cd8861d592ac1f9f1dc8fb5f6