Malicious PDF — malware analysis report

Static analysis result for SHA-256 da22324192ab5825…

MALICIOUS

PDF

69.8 KB Created: 2021-01-21 16:42:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2192a64aa8f6d189af8955b3fb152079 SHA-1: e645e62f062eb155fae072e8f94f65f3a031d7be SHA-256: da22324192ab58259b4018eca9797f23b54d4aadfdef0c55125a4b5e45e4b408
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body appears to be malformed or obfuscated, but the presence of numerous links suggests an attempt to direct users to external, potentially harmful, websites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=deltona+high+school+deltona+fl In PDF document text
    • http://wigomufeze.22web.org/atualidades_para_concurso_2018.pdfIn PDF document text
    • https://lobakazuperowe.weebly.com/uploads/1/3/4/3/134352895/vutiwumumusifo_numesusukolura.pdfIn PDF document text
    • https://site-1259056.mozfiles.com/files/1259056/darling_songs_teluguwap.pdfIn PDF document text
    • https://laxigotugib.weebly.com/uploads/1/3/0/9/130969680/499c7.pdfIn PDF document text
    • https://mefufexuwi.weebly.com/uploads/1/3/4/0/134019004/81bcec47.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/3231337.pdfIn PDF document text
    • https://rawubewo.weebly.com/uploads/1/3/1/4/131405976/788b0e93bc1469.pdfIn PDF document text
    • https://xazonulukobimov.weebly.com/uploads/1/3/2/7/132712199/vijado.pdfIn PDF document text
    • https://migivijebejod.weebly.com/uploads/1/3/4/0/134017877/pikazotexegon_xugajexadoso_timid_bixekezimu.pdfIn PDF document text
    • https://site-1248945.mozfiles.com/files/1248945/zajinorisekezupuvuzuxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://repefewuvu.epizy.com/damizenitegibafugasuv.pdfIn PDF document text
    • http://penoputibilexo.rf.gd/70906032515.pdfIn PDF document text
    • http://popaxaxi.epizy.com/23368497980.pdfIn PDF document text
    • http://zamoguwudegovo.rf.gd/accountable_ipa_referral_form.pdfIn PDF document text
    • http://pinezininefos.epizy.com/dobul.pdfIn PDF document text
    • http://wozawexopad.epizy.com/fonafede.pdfIn PDF document text
    • http://gejevebo.epizy.com/kurevesik.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC816 4976 bytes
SHA-256: 4ff5a42c9ab8eacbc225671df891840673c7efd506abfdcea3ada3650b1ca0a3
font_01_sfnt_off0000d904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 10352 bytes
SHA-256: 4f339fee58a00edb80644458129f42ca7de8ffce190925642051027f91db5e5f
font_02_sfnt_off0000fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3