Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff5f9490c137237…

MALICIOUS

PDF

63.9 KB Created: 2020-12-20 06:40:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ad8f4ac1bfdd7aacc3a9b2eeb9c3148c SHA-1: 9b590f376172eddf27ebeaa845770e776f6446e8 SHA-256: 8ff5f9490c137237b70a11fbd9c03d2e5de5971a2e0f9ef5fcd7ac3648e96f2c
146 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. It uses a callback-phone (TOAD) lure. 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 6

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://trafficel.ru/123?utm_term=davis+county+jail PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371003/normal_5fb538eb6752e.pdfIn PDF document text
    • https://mivegogoke.weebly.com/uploads/1/3/4/3/134365655/xurejo.pdfIn PDF document text
    • https://zevejekigo.weebly.com/uploads/1/3/4/3/134374512/cbfb1f64a.pdfIn PDF document text
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/wozuvegesekijuruv.pdfIn PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/kuwosojukevuvej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457838/normal_5fda1aaf54de3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387566/normal_5fd64a9451835.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448124/normal_5fc53e2d57771.pdfIn PDF document text
    • https://rulomegujenuguv.weebly.com/uploads/1/3/4/3/134329868/mowalibaf.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/tenabod_xekep_kinukuwemu_kajigedewexu.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/3e75a4e696b2f2d.pdfIn PDF document text
    • https://dubuzimonovox.weebly.com/uploads/1/3/4/3/134347386/2329439.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/peveziwoguxuzam/ash_creatures_morrowind.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/77273777322.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/rc_m_full_form.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_off0000be87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE87 4932 bytes
SHA-256: 7a8d5438410ef603dacc45e34bcd2c0b53df66c732062896e1775f86da2424d5
font_01_sfnt_off0000cf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7E 10296 bytes
SHA-256: 625147c145dd20c2bc4cb1d81afa50da4ef63cb9d72f5a2de0ebfc7acef1ddac

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