Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a6c927c1e7c48c…

MALICIOUS

PDF

78.6 KB Created: 2021-02-09 07:19:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0e4a6085ff8783f97f8062390b0328f0 SHA-1: 93b35edfe395a508a4879cc8c7a3090b901ba0fb SHA-256: a7a6c927c1e7c48c6dc0fa30fb4fc30dc7dad6dcd6acb5e2b771649e43eaf03b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to disposable domains, designed to redirect users to malicious sites. Heuristics indicate it's a link farm and a known malicious redirector, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=bass+fishing+guides+on+chickamauga+lake In PDF document text
    • http://kersita.space/67652546955s0j0.pdfIn PDF document text
    • http://copyrightnotice-ig.com/usos_de_la_fermentacionpytme.pdfIn PDF document text
    • http://nonretloli.site/95912409362lbx8n.pdfIn PDF document text
    • http://sfr-espace.best/21804982150k1ink.pdfIn PDF document text
    • http://talerexogite.iblogger.org/zowojumefurujida.pdfIn PDF document text
    • http://rollernefrit.xyz/bumerafuxed03d11.pdfIn PDF document text
    • http://hookup153.online/bogodutijunutavaremavojedxm53b.pdfIn PDF document text
    • http://adv-workshop.site/twilight_graphic_novel_volume_2_downloadm9urc.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/LZhMlgh/benadiwexemenafesu.pdfIn PDF document text
    • https://cdn.sqhk.co/damapegapi/dqvgghg/vifup.pdfIn PDF document text
    • http://storeeuro.info/bodumomiluz60y0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482230/normal_60024f7c48737.pdfIn PDF document text
    • http://jubivigupowo.iblogger.org/100_citizenship_test_questions_and_answers_2015.pdfIn PDF document text
    • http://onlinetiser.website/best_claw_machine_arcade_near_mehb9bs.pdfIn PDF document text
    • http://repair-telefonov.ru/goxirewidederatubetu83x48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420765/normal_5fc8fe1d48c07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407327/normal_6002d8d0623ae.pdfIn PDF document text
    • http://aycotoro0.xyz/tukovajoloduz36oho.pdfIn PDF document text
    • http://my-credit.info/706283202597hzlp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404112/normal_601218e75cdc3.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_off0000f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 5452 bytes
SHA-256: 009f1fe71f3276c568f29f0ff08c3c9270184c81ee72f8528c1581b4db4232a0
font_01_sfnt_off000109e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E9 10300 bytes
SHA-256: ae6ec1cf6de54ce228b36cb21a6b37cd0c878c31082825d204bd83e7b978eeb0

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