Malicious PDF — malware analysis report

Static analysis result for SHA-256 febc6d91f40a6992…

MALICIOUS

PDF

70.0 KB Created: 2021-02-18 14:28:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c8947ed513c19e7a5c662567933e3069 SHA-1: fcb862bbb12f13aaa1ac71f1e1591587c0a5c1d8 SHA-256: febc6d91f40a6992ad59067c9c82ffd19741f78bc50d189bbb6b47d68bd6c189
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF documents, likely for SEO manipulation or to distribute further malware. The presence of multiple external links on disposable hosting services, as flagged by heuristics, reinforces this assessment.

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://maypoin.ru/aws?utm_term=navien+ch+240+error+code+003 PDF link annotation
    • https://luxaxila.weebly.com/uploads/1/3/0/8/130814132/kaliwosoda-jikiwemekew-felemavame.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461245/normal_5fe4a5d2f210b.pdfIn PDF document text
    • https://tapizijivuvol.weebly.com/uploads/1/3/2/6/132696465/bubofevuvipinuwow.pdfIn PDF document text
    • https://cdn.sqhk.co/zupivikeg/iLHggRY/the_world_ends_with_you_switch_controls.pdfIn PDF document text
    • http://ighelpcenter.xyz/buzzed_drinking_game_cards8mrdf.pdfIn PDF document text
    • http://appletopshop.ru/adherence_to_institution-specific_ventilator-associated_pneumonia_prevention_guidelines5490n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416299/normal_5fc712842557f.pdfIn PDF document text
    • https://cdn.sqhk.co/tolademapati/4oeggm7/nda_exam_2020_date.pdfIn PDF document text
    • https://cdn.sqhk.co/ramazunor/Agghhhh/44970876136.pdfIn PDF document text
    • http://funseeds.site/9372456269f36sy.pdfIn PDF document text
    • https://verosogoteri.weebly.com/uploads/1/3/4/7/134738646/tulufekadusawe-rekawemuda-xevusofunolufa.pdfIn PDF document text
    • https://jejusutib.weebly.com/uploads/1/3/0/7/130740078/d7c670fc6e423d.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/9UghhhG/cheap_unlimited_international_calling_plans.pdfIn PDF document text
    • http://zuvewedapajazo.iblogger.org/interview_questions_and_answers_for_database_administrator.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AE 5372 bytes
SHA-256: bcbe29115a73a3ebc7cb10741ad86cf594b7ebe89c5f16c418c100e21fbe49b3
font_01_sfnt_off0000e80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80A 10096 bytes
SHA-256: 384284605f54412f5237527bcaad99cfb03f34ac9f739302aff4e76ec547e535

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