Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfbbb5eec1757df…

MALICIOUS

PDF

79.0 KB Created: 2021-03-02 05:05:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 87e9ea3589f93c85b3d79e61539439b9 SHA-1: e444eb66882cadfa16c2f2d172705fe2c7715c9f SHA-256: 3cfbbb5eec1757df309d6485dc6eea881e4ae72857ac4620204e3cec3e54da3f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of a URL with a 'utm_term' parameter suggests a phishing or malicious redirection attempt. ClamAV and ML classifiers strongly indicate malicious content, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://ponafet.ru/strik?utm_term=the+4+hour+chef PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454304/normal_600faf23c1717.pdfIn PDF document text
    • https://laverikiwife.weebly.com/uploads/1/3/4/5/134502667/kuvigofezegin_winikidafulusi.pdfIn PDF document text
    • https://sonefuvik.weebly.com/uploads/1/3/4/3/134325549/99779b0097ee34.pdfIn PDF document text
    • https://cdn.sqhk.co/lelabepena/b5ERjeP/wimebukumiwugipenux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476127/normal_602ac6b95fec6.pdfIn PDF document text
    • https://vetasokimatajed.weebly.com/uploads/1/3/5/2/135296406/6794740.pdfIn PDF document text
    • https://poxuweke.weebly.com/uploads/1/3/1/6/131606533/9514027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472491/normal_6015550711b3d.pdfIn PDF document text
    • https://kasexesupa.weebly.com/uploads/1/3/1/4/131437862/3972243.pdfIn PDF document text
    • https://kunejadisitezan.weebly.com/uploads/1/3/4/0/134096254/c78e860c9b.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/B8hi3Bu/sutuxore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456998/normal_603a113ece59e.pdfIn PDF document text
    • https://kujadivenudeku.weebly.com/uploads/1/3/5/3/135324903/mevobegawivitotosut.pdfIn PDF document text
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/7694678.pdfIn PDF document text
    • http://vuzitofakomuj.22web.org/bahubali_3_movie_mp4.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/vesubodufisi/55428344298.pdfIn PDF document text
    • http://satonavuka.rf.gd/85251211885.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/niselelize.pdfIn PDF document text
    • http://savikolapuxol.rf.gd/jabulani_africa_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/reading_comprehension_quiz_3rd_grade.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_off0000fb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 4584 bytes
SHA-256: 3d753b3522870e49d19bcb4831eca1f8d019e36f812d95f730c782794fc684f5
font_01_sfnt_off00010af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF0 10508 bytes
SHA-256: 05562af9f11fc1e555aa6121f6073bfce53c51418a545575acd798d5bd0984e0

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