Malicious PDF — malware analysis report

Static analysis result for SHA-256 02779fe905396ea7…

MALICIOUS

PDF

74.2 KB Created: 2021-01-25 18:46:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3493d383765927ad8d18481cd9680c10 SHA-1: e260e3ca092f4f20d623e049f8ea4f242493706f SHA-256: 02779fe905396ea7299787a6e4f68eee100c349410cf1ccfbbe98ba72fc45f02
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets, which is a common tactic for phishing.

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://trafffe.ru/123?utm_term=triangle+inequality+theorem+worksheet+grade+8 PDF link annotation
    • https://cdn.sqhk.co/ribobujir/V4tijxe/to_do_list_widget_ios_14.pdfIn PDF document text
    • https://wezusewowanura.weebly.com/uploads/1/3/4/2/134235680/b40ceac7b.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/hjgbgd0/ez_pay_credit_card_processing_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408323/normal_5fe1d0642079f.pdfIn PDF document text
    • http://metinozub.iblogger.org/60047575041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503874/normal_5fd1991ab9395.pdfIn PDF document text
    • https://mixojokujize.weebly.com/uploads/1/3/4/3/134387696/5617105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_600edcb736feb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462992/normal_6007d9241cdfc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puwagof.rf.gd/xagavegun.pdfIn PDF document text
    • http://fukasutatota.rf.gd/jubepuwamorilukub.pdfIn PDF document text
    • http://midelex.epizy.com/95647936034.pdfIn PDF document text
    • http://gewofudi.rf.gd/puwotelafevujufa.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_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 5764 bytes
SHA-256: 0bbc8ae0565ce0ffb8fc57d7f60fcdcf384648286600cfb53d70456ac60f890b
font_01_sfnt_off0000f6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 10776 bytes
SHA-256: 660ff82afdf0cf198cfef991e358644141585a281d420633bd23a2a52ca97368

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