Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c0e99cca2daead…

MALICIOUS

PDF

74.2 KB Created: 2020-11-26 14:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b68722b427cc592aba0a3901ccf04d73 SHA-1: eac91b874312b4356935304574fd63ed210545f5 SHA-256: a3c0e99cca2daeadec9c3d07eee9eaaf07fc36490c5ded0d0307412f80933fea
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/123?utm_term=joker+watch+online+hungama PDF link annotation
    • https://fevobubutexub.weebly.com/uploads/1/3/4/4/134481878/zibidonoxop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469626/normal_5fb61ed2741ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407986/normal_5fb8187b467c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453909/normal_5fadd26c999dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457563/normal_5fada4d96ea12.pdfIn PDF document text
    • https://sarununow.weebly.com/uploads/1/3/4/3/134366188/wumofonix-lusebati-kobuxigete-lavuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387713/normal_5f8d72b6876fe.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/wajufifenoxuj/26342351303.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/tigo_sports_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e918077c-d7f2-42df-afa8-50805043d445/the_big_bang_theory_season_6_episode_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60281b54-2485-400a-be92-87bae2b2447c/legend_of_zelda_majoras_mask_emulator.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_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 5180 bytes
SHA-256: dd599f7885468397f845adab0fc223cd8bf0b306f6326e00b0de9c2067c5a8fc
font_01_sfnt_off0000f726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF726 11056 bytes
SHA-256: 974598e16f0e79f7ec3c3fe4e3461163a1fa13acb8ebc1791bcdd1d931cca2dc

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