Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2d02bf38bf5b7d…

MALICIOUS

PDF

63.8 KB Created: 2020-12-18 14:44:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b26a4a1a7401ef37ca5cc56955a93ec SHA-1: d1681c245b74b9e2734630bf3eafa6c95087a033 SHA-256: 4b2d02bf38bf5b7d024d776e272dc4da073bbc2471f4fa6551f5e4d8f33b94e9
156 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, with numerous external URLs embedded within its structure. The primary malicious indicator is the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful content. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were directly extracted, the presence of embedded URIs and the overall structure point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/aws?utm_term=excel+dashboard+guide+pdf
    • https://cdn-cms.f-static.net/uploads/4445754/normal_5fd7b338b78bc.pdf
    • https://konozobit.weebly.com/uploads/1/3/4/4/134456152/7236019.pdf
    • https://rogusedi.weebly.com/uploads/1/3/4/4/134433103/lovexizosarak.pdf
    • https://jasazifo.weebly.com/uploads/1/3/1/4/131437377/mozaboj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bec26645-fa54-427f-97a8-89ed65fb1bb9/social_inhibition_in_psychology.pdf
    • https://static1.squarespace.com/static/5fceb5e508c42950581c0646/t/5fd6ef9d0f11661d4c408a1f/1607921565637/ronarisogilirulaze.pdf
    • https://uploads.strikinglycdn.com/files/5f48f17c-32a5-4649-b65e-47306f2c647b/lolefunokotenaretazafilig.pdf
    • https://static1.squarespace.com/static/5fc394bee2fce462bc9ccb38/t/5fcf2d3a509e863c682b23be/1607413050646/salinas_sports_complex_box_office_hours.pdf
    • https://uploads.strikinglycdn.com/files/ab389fae-5988-4e60-8c2c-d037518b56c3/vololufewi.pdf
    • https://uploads.strikinglycdn.com/files/d9353a28-9070-43ea-8ca6-d5f57e455298/john_snes_apk_download.pdf
    • https://uploads.strikinglycdn.com/files/39355b48-e6bc-43ba-95b8-ed4c8fb84d83/beachside_montessori_village_reviews.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1cb.bin
cb5f6dc79a79576915a04bb6550dc3a81d56419db50fa8914d2eb33257327899
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CB 5584 bytes
font_01_sfnt_off0000d4c2.bin
524417a26ed97a1853b2974201e79f003726f035d2867f8b80c9e8fa9d479478
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C2 8928 bytes