Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aea4c0a51dc24ec…

MALICIOUS

PDF

76.5 KB Created: 2021-06-09 21:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c191443faab96f4f99950749477887a SHA-1: 0756786cf3939811643fc1041f933f94467ee2e0 SHA-256: 7aea4c0a51dc24ecf6eb6065a1d9973780dc079784c6887dd9571b4ffcd9fcd8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable hosting, and a heuristic identified a visual download button lure. The embedded URL `https://oniceh.ru/pbw?utm_term=pokemon+moon+black+2+gba+download` suggests a lure related to game downloads, likely to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/pbw?utm_term=pokemon+moon+black+2+gba+download
    • https://cdn-cms.f-static.net/uploads/4413242/normal_60126cddd2700.pdf
    • https://static.s123-cdn-static.com/uploads/4374860/normal_5ff65ba446196.pdf
    • https://cdn-cms.f-static.net/uploads/4390350/normal_5fe679ba70e04.pdf
    • https://static.s123-cdn-static.com/uploads/4470698/normal_6004189291487.pdf
    • https://static.s123-cdn-static-d.com/uploads/4389090/normal_60b117a787230.pdf
    • https://static.s123-cdn-static.com/uploads/4378857/normal_5fedeb8d01c85.pdf
    • https://cdn-cms.f-static.net/uploads/4449419/normal_602028ae839e0.pdf
    • https://static.s123-cdn-static-d.com/uploads/4445544/normal_60b04d6f38d42.pdf
    • https://cdn-cms.f-static.net/uploads/4419849/normal_5fe7abff16856.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rugewenuzed.pbworks.com/w/file/fetch/144566895/how_to_hard_reset_iphone_6_without_home_button_and_black_screen.pdf
    • https://uploads.strikinglycdn.com/files/fdc0d1c8-5e83-4f63-8bff-468ae728b9ae/dds_discount_clothing_store_near_me.pdf
    • http://mikabipi.pbworks.com/f/exercice_sur_les_figure_de_style_4eme.pdf
    • http://davukuzu.pbworks.com/f/voforozuraxosowewepinajur.pdf
    • https://uploads.strikinglycdn.com/files/695f8f2f-5cdd-4380-9211-753978795b4b/cido_perclorico_formula_molecular.pdf
    • https://uploads.strikinglycdn.com/files/11cab48c-c097-403c-bd89-b28df1d27f5f/mibofosibibuxabujope.pdf
    • https://uploads.strikinglycdn.com/files/4fe7bc53-5fd6-4aed-9d68-e09754693d42/mizido.pdf
    • http://wojipag.pbworks.com/w/file/fetch/144843309/direct_and_indirect_speech_tense_rules.pdf
    • https://uploads.strikinglycdn.com/files/b8bb61c1-0497-48cf-8a26-6fd399cba7e6/sojomanexekixawodowa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9cb.bin
a8cb07f92f433eead334a172eea4c214ed3f2d21874b66912406e06d692ce5cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 5416 bytes
font_01_sfnt_off0000fc3f.bin
177d77f800db8259fa3aa21d2618a5fc74ca083457e381d2edbecb88b2913534		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 12248 bytes

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