Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a34cd712d4bad8…

MALICIOUS

PDF

73.1 KB Created: 2021-02-09 07:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6cb74c086b6812b019a00309e016597e SHA-1: 53d2a3a5f2891ff24194833fd0c22f2218a0c177 SHA-256: 79a34cd712d4bad8b9e1223f9c1a70fd8fe38b247fc43ebf41088b8cb259292a
186 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including brand-impersonation credential phishing and ML-based detection. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to malicious sites. One notable URL, https://zusajozaza.weebly.com/uploads/1/3/1/3/131381142/1671982.pdf, is identified as a redirector for a credential phishing lure impersonating 'target'. Although no scripts were explicitly extracted, the PDF structure and URL analysis strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zusajozaza.weebly.com/uploads/1/3/1/3/131381142/1671982.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://seumenha.ru/aws?utm_term=critical+ops+credits+hack PDF link annotation
    • https://cdn.sqhk.co/repipedifavi/eszXgdd/7478028616.pdfIn PDF document text
    • http://zefakelilivaxo.iblogger.org/superman_and_batman_java_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_600bffd2a5446.pdfIn PDF document text
    • https://cdn.sqhk.co/kexofodatop/iczSWRi/45082982686.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/hje2Ol1/52964332072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_601b0d9d6f541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417208/normal_5fd880c127db6.pdfIn PDF document text
    • https://zusajozaza.weebly.com/uploads/1/3/1/3/131381142/1671982.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5ff0014c5b032.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372719/normal_5feeb3bbd071d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487208/normal_600eaf10ab79e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466135/normal_6006961ed30d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372085/normal_60081c98e566a.pdfIn PDF document text
    • https://jutoxanifi.weebly.com/uploads/1/3/5/3/135321179/nunegusolojine-wapipegipisen-suregifimi-pirutuf.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/iFuhjib/707530943.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zekubegem.epizy.com/bhaktha_prahlada_audio_songs_free.pdfIn PDF document text
    • http://gifefuko.rf.gd/autocad_2007_free_mac.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_off0000e25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25C 5132 bytes
SHA-256: 252d998cfdd6079651288a55522b7c211ce976772d1de3ddca62172e2aa3f2ff
font_01_sfnt_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 10488 bytes
SHA-256: ee8cc848edbd57a34122660311628c066cc5f06122a177b600d000817e9f2f3e

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