Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfddec4edfabaf4…

MALICIOUS

PDF

81.0 KB Created: 2021-06-01 03:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c425c56aa0a3c3b6f7eb020e821d9d08 SHA-1: 331cf29036a16e158c9c20b6cda0cfba2edcea49 SHA-256: 3cfddec4edfabaf4348f269162159b626ff5378877bb6f702974545c2aa8a544
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, contains references to "mobile legends skin hack mod apk", suggesting a social engineering lure. The presence of external URIs, particularly the one pointing to allytemp.ru, further supports its role as a phishing or malware distribution vector.

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://allytemp.ru/pbw?utm_term=mobile+legends+skin+hack+mod+apk
    • https://cdn-cms.f-static.net/uploads/4371505/normal_6035c7aa9c9b4.pdf
    • https://gubilipolijig.weebly.com/uploads/1/3/4/7/134707964/kegokikasux-seviriseru-kulike-mifidoxonude.pdf
    • https://dizegovonaziluz.weebly.com/uploads/1/3/4/8/134881707/tazanapuwitibew_robitefususiv_xutufameguvu.pdf
    • https://cdn-cms.f-static.net/uploads/4491669/normal_6065f1c68804e.pdf
    • https://cdn-cms.f-static.net/uploads/4478688/normal_6014a018e08dc.pdf
    • https://cdn-cms.f-static.net/uploads/4413986/normal_60205f0b475ae.pdf
    • https://wezusuruga.weebly.com/uploads/1/3/4/0/134096163/3110989.pdf
    • https://static.s123-cdn-static-d.com/uploads/4451228/normal_60b471cd77005.pdf
    • https://gasibexagitusin.weebly.com/uploads/1/3/1/4/131408117/josufimikoj.pdf
    • https://cdn-cms.f-static.net/uploads/4503050/normal_603c35ec85d96.pdf
    • https://cdn-cms.f-static.net/uploads/4468286/normal_600ff873710ba.pdf
    • https://kijapipova.weebly.com/uploads/1/3/1/4/131407887/5c21858a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://risoxef.pbworks.com/f/46405299344.pdf
    • http://wiwedano.pbworks.com/f/wodinawadunun.pdf
    • http://mikabipi.pbworks.com/w/file/fetch/144432558/aunque_me_cueste_la_vida_libro_gratis.pdf
    • http://mifimoruzuwo.pbworks.com/w/file/fetch/144432540/madalin_stunt_cars_3_tyrones_unblocked_games.pdf
    • http://godekazonigi.pbworks.com/f/minecraft_pocket_edition_for_pc_windows_7.pdf
    • http://kapetipubi.pbworks.com/f/26071074048.pdf
    • http://kufujibumufa.pbworks.com/w/file/fetch/144424044/english_file_upper_intermediate_students_book.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_off0000f2d6.bin
cba4bedb9f3dfd5b0a1f0f7db0a324abd9f5bfc43cfe78abeff41cb7f2c0e3cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 5600 bytes
font_01_sfnt_off000105cb.bin
d159ea403dbfdb2b1c37b3bb0cbc765dfcccbc5e450e7011721808dac50fa17c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 21884 bytes

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