Malicious PDF — malware analysis report

Static analysis result for SHA-256 78109df16ac1ae46…

MALICIOUS

PDF

85.4 KB Created: 2021-03-23 01:16:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f19999115076f961ab8faf5794b198f4 SHA-1: 505760c8777d9c9a8cb609646d4d2202ec64fc6a SHA-256: 78109df16ac1ae46e7c6363ea5e1d2e59ae1b99f647372877ad21c4c6fc55653
176 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm or SEO spam, directing users to numerous external URLs, one of which is a known malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is designed to lead users to potentially harmful content.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://zajinet.ru/award?keyword=ariens+compact+24+pdf PDF link annotation
    • https://cdn.sqhk.co/pixefavenar/ihBihib/battlefield_2_artillery_how_to_use.pdfIn PDF document text
    • https://cdn.sqhk.co/bexutavukaro/hhhbyhi/descargar_aplicacion_cuballama.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/aDJxEgi/6549702401.pdfIn PDF document text
    • http://xufotegebiv.22web.org/sikefumejoxafoso.pdfIn PDF document text
    • http://kubidojizuw.22web.org/50436127843.pdfIn PDF document text
    • https://cdn.sqhk.co/tinajugezepi/RZuRNR5/super_word_search_puzzles_baking_christmas_cookies.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e4d96d7-92f1-4145-9aac-d1976e75dfe6.filesusr.com/ugd/49a98b_b2d5c6e99599440fb96329961f7e20f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/nivuvosaloxugiwakof.pdfIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_d21730280af14639a731dd66470c541b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/gabriels_inferno_book_summary.pdfIn PDF document text
    • http://gomupinoteripa.epizy.com/11524993711.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/antigen_specificity.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/pisciculture_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/major_depressive_disorder_fact_sheet.pdfIn PDF document text
    • http://liraguzulo.epizy.com/formal_clothing_brands_in_pakistan.pdfIn PDF document text
    • http://bexamunexena.rf.gd/emiway_machayenge_song_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/esl_grocery_shopping_worksheets.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_off000109d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D8 5480 bytes
SHA-256: 37c2e37c5ebf29164add755593370452efe7755efea4c22b9cf72e06e744a7e8
font_01_sfnt_off00011c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 12676 bytes
SHA-256: 00b58d107d7c33507a974214936814013cb4c304d047415e0ecf84d33dd1328d

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