Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc35a13741223db0…

MALICIOUS

PDF

90.5 KB Created: 2021-03-20 18:01:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 920c1d4a3f8026ba3e521b8611e09a7f SHA-1: cfa42d1c270034a319a1abf02785b3829faa6014 SHA-256: cc35a13741223db0115327ed50bb07e243aaab0bb19ba002e2fd02cd5034703c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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-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.
  • 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://mezovuduw.ru/wix?keyword=sears+41a4315+7a+manual PDF link annotation
    • http://lozhobelir.space/vedufezelatunofrymfw.pdfIn PDF document text
    • http://shoppingyxplus.xyz/7097998112853649.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451932/normal_5fca104b4c09e.pdfIn PDF document text
    • https://faboduvo.weebly.com/uploads/1/3/5/3/135343103/tekatose.pdfIn PDF document text
    • http://shopsmmv.site/kekeralurixu0a9ih.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495391/normal_602599133d220.pdfIn PDF document text
    • https://xutepodufolesik.weebly.com/uploads/1/3/0/7/130739265/folajimutim_mefow_novatapetigikiv.pdfIn PDF document text
    • http://kataeta.club/fannie_freddie_underwriting_guidelinesegndr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454559/normal_5fdba9551f067.pdfIn PDF document text
    • http://retys.fun/brazil_team_logop2s56.pdfIn PDF document text
    • http://lojasamericanasbr.com/rufewifovogubaf16pp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373768/normal_5fca23b0922b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382782/normal_5feb32da444b4.pdfIn PDF document text
    • https://zokesafan.weebly.com/uploads/1/3/0/7/130775675/0ceadc.pdfIn PDF document text
    • https://nofoxevejumumu.weebly.com/uploads/1/3/1/8/131857054/8952787.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_a67759d82c224506aabd99c138d04042.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/capricho_arabe_guitar_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/tuderixipikezenipi.pdfIn PDF document text
    • https://2aa0b900-127f-4603-a19a-6a731d3c9eb1.filesusr.com/ugd/5eaffa_b1f6efc266694877b2b86d476b2c2cf5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/aix_java_7.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_off000125cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 5444 bytes
SHA-256: 9f4188c16ab85d58babdd77a8ff50c31a557ffa3ca66a3ceffc4bc87c7c28161
font_01_sfnt_off0001384b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384B 10732 bytes
SHA-256: 3d35bfaa7d0cbff7c8900211c5c1165592a122367d2e546cb5b07a6851ffa6f7

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