Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d9d03ac9a0565f…

MALICIOUS

PDF

62.0 KB Created: 2021-02-25 03:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c97bdac1d2dd6c15e211e270f195f0f0 SHA-1: d749c77ad8b2bb98546444e992ea18d3869f8991 SHA-256: b8d9d03ac9a0565fc9fa02f57aab77140a42f9885b5773ab0dd94f0dacfd4fe5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, suggesting it is part of a link farm or phishing campaign designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs are indicative of techniques used to deliver malicious content or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://jacksth.ru/123?utm_term=how+to+cook+rice+in+microwave+pressure+cooker PDF link annotation
    • https://cdn.sqhk.co/samekikogeri/iaNjejc/63721186620.pdfIn PDF document text
    • https://cdn.sqhk.co/vabedesi/hicygg9/egg_inc_prestige_formula.pdfIn PDF document text
    • http://golomashvanna.xyz/sims_3_exchange_content_wont_installtv4cr.pdfIn PDF document text
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/05c5fa8bdd.pdfIn PDF document text
    • http://ehaberdevlet.com/awaken_my_masters_meme_templates43ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450257/normal_5ffa5d4b69930.pdfIn PDF document text
    • https://sowibize.weebly.com/uploads/1/3/5/3/135348762/a58c8167e964f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401538/normal_5fedd5ded7c2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485301/normal_60167bee2b254.pdfIn PDF document text
    • https://cdn.sqhk.co/xezojutatow/jiXnjin/20390633477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457011/normal_602f127a5d2dd.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/ijNhcgi/gooz_io_unlimited_money.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_off0000ba42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA42 5224 bytes
SHA-256: d395c24727d9b5c77da466b3080e050cc4b7fdcf4c8a99d26729d0ea10375650
font_01_sfnt_off0000cc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC05 9184 bytes
SHA-256: 5761dba3133c891e99d4270a5ff083309e571a1f71311f4072d2040118377414

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