Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fefcfe6213f3b4…

MALICIOUS

PDF

82.3 KB Created: 2021-05-22 15:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 20d1f8e6265cd6226c3062fa6a8c804e SHA-1: 528feae8e342db65577f5ec69cc656b91a5c4389 SHA-256: d4fefcfe6213f3b4f5382ac2df131f74573e41c18d104f76f3144db54b241eab
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/strik?utm_term=tyler+state+park+pavilion+rental PDF link annotation
    • https://xibimitavidin.weebly.com/uploads/1/3/1/8/131871740/9895565.pdfIn PDF document text
    • https://jimekomu.weebly.com/uploads/1/3/1/4/131453536/f34bfaf6bcd.pdfIn PDF document text
    • https://bepizapumi.weebly.com/uploads/1/3/5/3/135349865/f89dd5c241b.pdfIn PDF document text
    • https://zunepijubu.weebly.com/uploads/1/3/3/9/133986973/17277.pdfIn PDF document text
    • https://miremawa.weebly.com/uploads/1/3/4/6/134631892/c952fe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500453/normal_602a064cb6ecf.pdfIn PDF document text
    • https://xowozasa.weebly.com/uploads/1/3/3/9/133999953/fanexu_vubijife_nomurarove_didipap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426423/normal_602a193330d6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497368/normal_601f359a23fb4.pdfIn PDF document text
    • https://timivoza.weebly.com/uploads/1/3/5/3/135315173/1808754.pdfIn PDF document text
    • https://zefilezagomi.weebly.com/uploads/1/3/4/4/134474677/gusiripafizafe.pdfIn PDF document text
    • https://riwetomawojok.weebly.com/uploads/1/3/4/5/134516188/nobavokos.pdfIn PDF document text
    • https://buginibonimej.weebly.com/uploads/1/3/2/7/132711973/wumisedesusezat_sodivetut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e7e0196-896c-4c0b-8d78-70cd27890635/88787008601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf2fb4ba-126c-4a1a-b16b-d0f5636a532b/1751836209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d51762a-f97d-4f7c-bd99-6d985625345d/after_the_trade_is_made_revised.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb6479fb-08ba-42d3-befd-d2723c2cf594/who_created_flat_and_round_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d09111b2-3e4d-4c78-b31a-8c3aa84a1ba7/how_to_tell_if_your_air_conditioner_compressor_is_bad.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_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 4988 bytes
SHA-256: e986f7c56803193d0fd95fe32a1d6ae3d1d0c034d5272755dd81606d786c5204
font_01_sfnt_off0001191f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191F 10320 bytes
SHA-256: 0755a3c3c6f0d17693f73d65a216e1daafe77cf6becdbb1d597f3c491c2b8c41

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