Malicious PDF — malware analysis report

Static analysis result for SHA-256 403f7f7bb38dcb25…

MALICIOUS

PDF

81.4 KB Created: 2021-05-12 17:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 16a8aaf65a5c8b043d87da5df143f4d4 SHA-1: aa8f49e486d6971a0859ebf0b718b00340bbe628 SHA-256: 403f7f7bb38dcb256be670f5dd2318352db8e619fb22df4b00ae50b0f883eb30
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to printer issues, intended to trick users into clicking the malicious links.

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://xajibur.ru/strik?utm_term=why+does+my+hp+printer+not+stay+online PDF link annotation
    • http://5dradio.ru/94694474665tz2ys.pdfIn PDF document text
    • http://dreabling.online/facebook_videos_without_any_app0jqk1.pdfIn PDF document text
    • https://cdn.sqhk.co/muzolorakow/ji4I9QC/26464062634.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451544/normal_5ff30ccf2112b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409248/normal_5fd226fbea369.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxatotukaru/ijejiGC/kozuxudivunit.pdfIn PDF document text
    • http://everydays.space/livro_sobre_candombl7i22a.pdfIn PDF document text
    • https://cdn.sqhk.co/folukize/fkOTCTy/kulijesekime.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/IsCjcQr/extreme_basketball_trick_shots.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475741/normal_6004da8cc0e3f.pdfIn PDF document text
    • http://themarkuzmusic.com/chicago_manual_of_style_reference_generatorw3xwf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_01f9da901df74223ac49fdc2e7f65551.pdf?index=trueIn PDF document text
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_59d270ef60fc419ea0cef2e8e3b7be9c.pdf?index=trueIn PDF document text
    • http://voxinuxo.epizy.com/59436862357.pdfIn PDF document text
    • http://bumevibil.epizy.com/kexelekox.pdfIn PDF document text
    • http://vapamul.epizy.com/diablo_3_season_22_best_class_set.pdfIn PDF document text
    • http://sawesupunozigiv.atwebpages.com/jotunegokatudopixapu.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/how_to_tie_an_adjustable_single_knot_bracelet.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_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 5312 bytes
SHA-256: 959c0ed29a49dd2a479d74aba1d262f5a4ad2a89b2f474b282b4cb798932bdc0
font_01_sfnt_off000114a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A1 10488 bytes
SHA-256: dc3c959299c97dfdc9fbfc3fd6d5e3546870b6be200b27d8e5c72431ed1bf241

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