Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb2ef5c2b03807b…

MALICIOUS

PDF

72.3 KB Created: 2021-02-22 05:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 22a88700ced9f2795759b169e242ae1c SHA-1: 527ea2c72ac3da06d55b706d17ab4e5a7b8f61fb SHA-256: 8fb2ef5c2b03807b98adca4932b83f310e3d7ac0a13577a5278efc272db2ee3a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/123?utm_term=chamberlain+whisper+drive+code+reset PDF link annotation
    • https://zomimodobi.weebly.com/uploads/1/3/0/7/130739583/zinenim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476445/normal_603132c6237b5.pdfIn PDF document text
    • https://cdn.sqhk.co/rusobotakox/heEigjj/92059621099.pdfIn PDF document text
    • https://bojuwidus.weebly.com/uploads/1/3/4/6/134698781/xaropi-sojupo-gafoxa-watinajerakane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454420/normal_603316f28b208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485173/normal_6032fd9bb1364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422385/normal_602e796eb65b7.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/ja5ihr9/65067789822.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408186/normal_5ff70b378ceda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474979/normal_5ff4755f80268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474206/normal_6031c0208544f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426262/normal_601970bc73c3f.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/Mgeicvv/zojefalakazekujilumib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448536/normal_5fe455c195b2d.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/dicrigC/epic_astro_story_tips.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409607/normal_602ffefb87b83.pdfIn PDF document text
    • https://cdn.sqhk.co/vigefifobot/ihictLQ/fantasypros_monkey_knife_fight_promo_code.pdfIn PDF document text
    • https://cdn.sqhk.co/fasazani/euKgc8w/reviwidonusiborarag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403273/normal_5fdac4f70311a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF6 5416 bytes
SHA-256: b839ab93ad97fd39cea229690ba5bc3e66f12d04e2acac4e9d5077be36d9c668
font_01_sfnt_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 10456 bytes
SHA-256: b67b827fa220e608d1dbe01975791e678853aa0938c32d0e35735f6208242d83
font_02_sfnt_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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