Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e72bf539dec883…

MALICIOUS

PDF

68.4 KB Created: 2020-11-14 11:48:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8c188ac369aafbe8545abf73d65b58f5 SHA-1: 1a08820764e1a39aa6fc11b5d09fc6a7269308e2 SHA-256: 99e72bf539dec883fa5a569a5c6e44c3a2093526a06ce96e424084b9c2d2b65b
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with a significant portion hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafffe.ru/123?utm_term=rdr2+arabian+horse+stats PDF link annotation
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/9649549.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/kumibozugadif-wogabo.pdfIn PDF document text
    • https://xuxuroxipekawip.weebly.com/uploads/1/3/4/2/134265976/40c08.pdfIn PDF document text
    • https://xoretesani.weebly.com/uploads/1/3/4/3/134315313/zojofal.pdfIn PDF document text
    • https://gifuroromila.weebly.com/uploads/1/3/4/3/134377961/guximusad-kolag-vujefurotodat-zejak.pdfIn PDF document text
    • https://zitidatuviwe.weebly.com/uploads/1/3/4/4/134493200/ruxabevoxurofab.pdfIn PDF document text
    • https://kugavibutatabo.weebly.com/uploads/1/3/4/6/134613496/lejejurum.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/b1563226-d7e4-4fe0-8ccd-bf55fa9b47ec/body_system_questions_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92051e79-996b-44ff-9777-75cd02683565/wraith_the_oblivion_20th_anniversary_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d81b0b43-a5fe-4765-ac2a-ddbc182fa7a1/negukitanujago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f6d8845-66f4-4b83-94e3-d3f0fc3a1cfa/29308006428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b78cea05-3b27-4fae-8d2c-1ebbd5b86b7a/usc_womens_basketball_media_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/808420e7-d636-44c0-8e84-e1bcd88db765/15163867691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b98989-034a-4221-a437-cb12139a8c35/89589829965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1836300b-24c5-482e-90e7-de505f829031/70095597892.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_off0000cf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF17 5160 bytes
SHA-256: 7fa05ae3e1b42e47fb830837c299ead8eaae88af218ff007180e600d38a8d13a
font_01_sfnt_off0000e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 10520 bytes
SHA-256: a0d538768137dbb6fb784c3a5d667321941f8eee673af592418d8311cdcfc4e3

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