Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdb686734cf6eb7…

MALICIOUS

PDF

76.3 KB Created: 2021-01-21 10:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 22929b923f6fd80c39fef99901b7ea2e SHA-1: d22b675d701267dd1f11174d797b44ccc8886130 SHA-256: 4fdb686734cf6eb7301f4ad0b1168f8f46fe10d6fe609cb7a902a18b5e087810
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, as malicious. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to redirect users to potentially harmful content.

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 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://jacksth.ru/123?utm_term=the+screwfly+solution+pdf PDF link annotation
    • https://patijunig.weebly.com/uploads/1/3/0/9/130969449/xuzazem.pdfIn PDF document text
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/tubefowaxebegowup.pdfIn PDF document text
    • https://site-1171384.mozfiles.com/files/1171384/halloween_costumes_for_kids_girls_target.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/jagijdN/domino_smash_3d_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490547/normal_5ff3c6045a540.pdfIn PDF document text
    • https://site-1083781.mozfiles.com/files/1083781/the_archers_radio_show_gifts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f89abbad0628.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368228/normal_5fb2ab5b5a908.pdfIn PDF document text
    • https://site-1166601.mozfiles.com/files/1166601/friday_the_13th_killer_cut_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/bezorufuv/cVWjhgc/dog_running_after_you_dream_meaning.pdfIn PDF document text
    • https://bonifivudinuf.weebly.com/uploads/1/3/4/3/134305406/1f655c739bc8c.pdfIn PDF document text
    • https://site-1168308.mozfiles.com/files/1168308/47573387256.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/nitatotol/god_guide_him_quotes.pdfIn PDF document text
    • http://gerekuvuburase.epizy.com/terivamekoz.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_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 5176 bytes
SHA-256: f37ee728bb851139d4877fc7edc04b1b63e8f6313f77a58c408b3bae41dd2bd8
font_01_sfnt_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 10872 bytes
SHA-256: 501e88de202d0aac1a256a2910972f8c41c31fc6515f82416aa3842111988fa9

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