Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a428641927219c…

MALICIOUS

PDF

70.5 KB Created: 2020-12-16 19:16:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: df4e2a2456f6c0e98a5791bae4532546 SHA-1: cb7804f2924668c3aaa74a786d1f3a7c4e47983b SHA-256: 77a428641927219c4ec461379e458f9d926cfd32318a5b469a65efaeb8ce6eb4
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm, with one prominent URL pointing to a sports stream, likely a lure. ClamAV and ML classifiers strongly indicate maliciousness, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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/123?utm_term=barcelona+vs+sevilla+live+stream+online+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379485/normal_5f96a5a0de937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479710/normal_5fc2b38c9b4e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378155/normal_5fcc67ad2e7b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404528/normal_5fb70ba6b0608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474719/normal_5fbf193f4645b.pdfIn PDF document text
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/57836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446937/normal_5fad32f675d09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_5fd646418dd6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_5fd9d1235a84d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbffcc36609fd0ee78c2f31/t/5fcf641d0496d067bdd23510/1607427102557/hockey_sticks_for_sale_nz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0bdb30f-ed08-4728-974d-70bdd4310374/34221725160.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_off0000d1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D9 5136 bytes
SHA-256: e528a6b2044bdb4a7ddda09694fb7407e9bafc196007f27f3473f4daef37f2c1
font_01_sfnt_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 12232 bytes
SHA-256: 3f96103e5e93bb95fd17409d6ac29706ba7898681145e6d84fc3c7b063945407

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