Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f755dd32e543b0…

MALICIOUS

PDF

44.3 KB Created: 2020-10-05 10:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 52853066559cfb3f5bbe5c35021a7643 SHA-1: 6382a8e2dfc8f911d76e9cbc8774d65a150a4395 SHA-256: 41f755dd32e543b0899e4127324dacf2dacb0bb9f0dd8426fc9e8f85d0e8f5c6
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be part of the lure, suggesting a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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://cctraff.ru/strik?keyword=reliability+centered+maintenance+2nd+edition+pdf In PDF document text
    • http://tonow.oldschoolsailing.com/uploads/1/3/1/6/131606295/zonijitekojo_xasonitamet_gilapuzenilekev_muraf.pdfIn PDF document text
    • http://gisedato.fruitandseed.com/uploads/1/3/1/8/131857247/9529519.pdfIn PDF document text
    • http://gotofenur.dreamweaverscollective.com/uploads/1/3/2/3/132303052/bejoso.pdfIn PDF document text
    • http://files.yaahi.org/uploads/1/3/0/7/130738960/musekelivubobas.pdfIn PDF document text
    • https://site-1037125.mozfiles.com/files/1037125/2475494703.pdfIn PDF document text
    • https://site-1038539.mozfiles.com/files/1038539/40974599996.pdfIn PDF document text
    • https://site-1036996.mozfiles.com/files/1036996/972371792.pdfIn PDF document text
    • https://site-1036731.mozfiles.com/files/1036731/31043722305.pdfIn PDF document text
    • https://site-1039815.mozfiles.com/files/1039815/31452374095.pdfIn PDF document text
    • https://site-1037187.mozfiles.com/files/1037187/15598516818.pdfIn PDF document text
    • https://site-1036636.mozfiles.com/files/1036636/majixokitokaxugosuj.pdfIn PDF document text
    • https://site-1036924.mozfiles.com/files/1036924/gidatovij.pdfIn PDF document text
    • https://site-1043565.mozfiles.com/files/1043565/61120109659.pdfIn PDF document text
    • https://site-1036925.mozfiles.com/files/1036925/11020001457.pdfIn PDF document text
    • https://site-1038943.mozfiles.com/files/1038943/59435428916.pdfIn PDF document text
    • https://site-1039915.mozfiles.com/files/1039915/9788321186.pdfIn PDF document text
    • https://site-1036821.mozfiles.com/files/1036821/75057821181.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://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_off00005ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF0 5292 bytes
SHA-256: cfef1f47a3aa4384c0a184433b42cf1d2a64364f1fcca3e64e89500a126dcd04
font_01_sfnt_off000071d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71D6 10440 bytes
SHA-256: 5c9e20e88a2222ea959d8f3d1ae805bc89334c40b3d16f76b20fdc19710e839e
font_02_sfnt_off00009585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9585 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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