Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10b958fc97329fe…

MALICIOUS

PDF

70.5 KB Created: 2021-02-15 16:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0142ec76f87ef501949c5485553289cc SHA-1: a5bc3da052f62b46e660ad821b7aeb7b59209343 SHA-256: a10b958fc97329feb40dd2e6a6ad304d34b993f185d257fa042439fe2310e0b5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://baarspo.ru/strik?utm_term=iowa+code+633.238 PDF link annotation
    • https://cdn.sqhk.co/xewimoziwuvo/1A9jaid/ark_survival_evolved_switch_review_ign.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/age3H6l/witcher_3_craft_enhanced_griffin_sword.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/w5jbVhh/toon_blast_game_play_online_free.pdfIn PDF document text
    • https://mozufidapu.weebly.com/uploads/1/3/4/0/134012608/89174de.pdfIn PDF document text
    • https://zoviwifave.weebly.com/uploads/1/3/6/0/136053666/kegoxoxodax_zukejamawute.pdfIn PDF document text
    • https://cdn.sqhk.co/pulijidapis/jSiipeY/4_pictures_1_word_game.pdfIn PDF document text
    • https://fobabunopana.weebly.com/uploads/1/3/0/9/130969757/rodero-tizedo-mojipikobo.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/jifjgja/game_idle_stickman_mod_apk.pdfIn PDF document text
    • https://sajofagexureleb.weebly.com/uploads/1/3/4/6/134652103/3082983.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/ayggSW9/cheap_fresh_fruit_and_vegetables_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sajezife/71398371472.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/54894953484.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/66090340254.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/62639669532.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/mac_os_catalina_location.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/coloring_sheet_for_kid.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/marksheet_loan_in_jharkhand.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/sydney_tv_guide_sunday_night.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/70571262405.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_off0000d6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FC 5332 bytes
SHA-256: b4712ea1a67218ec23dfddd08e527ae39cb6b156e478598e0a42cf9145f83fb1
font_01_sfnt_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 10648 bytes
SHA-256: 3277f1a0b23d4e2f9947820ab7b3352604ccb1ad648a2580d55eaf1cadda8f5e

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