Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2ddef4566d7a464…

MALICIOUS

PDF

69.0 KB Created: 2021-01-02 13:44:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ccdcb6eeb7ace5dd1317e119e6e9f829 SHA-1: bae39a2edfba7d62d797d850a13aed4dbb898086 SHA-256: e2ddef4566d7a464ac29b4eb716b9d9ae2618860921b84e09ec20bb182b4b89f
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers strongly indicate maliciousness, specifically a phishing or trojan payload. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

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
  • 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://trafffi.ru/123?utm_term=delta+shield+spray+video PDF link annotation
    • https://pixizibonemitu.weebly.com/uploads/1/3/1/3/131382366/pefilazejobo_wuluwobab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374198/normal_5feff0e936c3d.pdfIn PDF document text
    • https://daletutanedura.weebly.com/uploads/1/3/1/6/131636587/fapibuvane-teputeko.pdfIn PDF document text
    • https://sovewepipofev.weebly.com/uploads/1/3/4/8/134846449/4608671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_5f94defd2e87a.pdfIn PDF document text
    • https://xigepeseforala.weebly.com/uploads/1/3/4/5/134508125/9b8a15.pdfIn PDF document text
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/finidegebibig.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/vovabagubajegeb/ixl_answers_algebra_2_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e9fc887-24ba-45c1-9e3f-dabfd687de8b/sanlucar_de_barrameda_pronunciation.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/netflix_serien_en_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/gukibovejagotimekalatajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b2416a3-0702-43ca-96d1-c3f46dd441e1/jivilus.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_off0000cdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFB 5208 bytes
SHA-256: 1a6088c6e31b2d824dbacbf7bb706a8e5c09d760837e681f0455f03c403dbe2e
font_01_sfnt_off0000dfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBD 11060 bytes
SHA-256: 574842dc3ee268594d217559bbd73e8c3acb0494fdff070ae7896687fc9885ad

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