Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c83249d63ee2ff…

MALICIOUS

PDF

68.8 KB Created: 2020-11-25 03:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0ed4c7efdb00d5466c5e1b7f6b6bc041 SHA-1: b87f1bdadf2a9f328586b0e91c9d7707991f78e8 SHA-256: e0c83249d63ee2ffdc38b611e6ddf1a6ab0d0b479cefd66ac791eaeb05a577ef
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, for being malicious and a credential phishing lure. It contains numerous external URLs, several of which point to disposable hosting and redirectors, indicating an attempt to obscure the final malicious destination. The presence of 'brand=target' in the heuristics strongly suggests an impersonation attempt to trick users into clicking malicious links.

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
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://kadogejajufa.weebly.com/uploads/1/3/4/7/134717900/wesuluwezexe.pdf.
  • 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://trafftec.ru/strik?utm_term=a+lesson+before+dying+chapter+1+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379605/normal_5f9b47464fc5e.pdfIn PDF document text
    • https://kadogejajufa.weebly.com/uploads/1/3/4/7/134717900/wesuluwezexe.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/jakodupanuwolo_buzupagereke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445338/normal_5fac43dde116d.pdfIn PDF document text
    • https://bolewotimeri.weebly.com/uploads/1/3/4/6/134689798/patudubugo.pdfIn PDF document text
    • https://xiwofisenitew.weebly.com/uploads/1/3/4/8/134879753/29ef781.pdfIn PDF document text
    • https://rewiwolidinagi.weebly.com/uploads/1/3/4/4/134481042/detegijuluxini.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/98419b2d-4196-42ce-b9d7-0dd9a8fca29e/4796836888.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/vuwav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58833b64-cf7d-43ed-8815-68430e4ca462/18609644228.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/jan_ernst_matzeliger_where_was_he_born.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a2f7154-6da9-4ece-8ba7-8769cdc852cd/29499114111.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/revorasaz.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/veredimi.pdfIn PDF document text
    • https://s3.amazonaws.com/lopazura/16034677018.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_off0000d119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD119 5700 bytes
SHA-256: 87cc5df3493d97b8be88ed7808e489f106d0fc83405b3e560a0a4ef1b8959888
font_01_sfnt_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 9896 bytes
SHA-256: 3f80c4cc81b967c5f7c9f99880c6f76fdcc259d84b68336d76001d922e8e6e7d

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