Malicious PDF — malware analysis report

Static analysis result for SHA-256 81159a4a70ff628a…

MALICIOUS

PDF

83.2 KB Created: 2021-01-16 15:02:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf041c6eb94d48191023e6205d73daba SHA-1: bc5e52d2c29d49d499793397c1f9e613ea6e20a8 SHA-256: 81159a4a70ff628aa46d6f86d87c6c84c01b10deb0fac82a5b72d1e97a10bdfb
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to 'Icsh guidelines in hematology laboratory practice'. No scripts were extracted, but the high number of external links indicates a strong intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/aws?utm_term=icsh+guidelines+in+hematology+laboratory+practice
    • https://site-1177263.mozfiles.com/files/1177263/top_spanish_music_2019.pdf
    • https://goxagakile.weebly.com/uploads/1/3/4/3/134316835/dc69a820e.pdf
    • https://site-1197344.mozfiles.com/files/1197344/zasumilatotizun.pdf
    • https://site-1175728.mozfiles.com/files/1175728/azar_hacked_apk_unlimited_gems.pdf
    • https://cdn.sqhk.co/bipobulif/2wdsuie/penoluloxusazezajixapige.pdf
    • https://febewizonobuwom.weebly.com/uploads/1/3/4/3/134311996/5085862.pdf
    • https://cdn-cms.f-static.net/uploads/4409255/normal_5fd30df06634d.pdf
    • https://cdn.sqhk.co/gudopokobipa/gtiihhJ/paper_toss_crazy_games.pdf
    • https://fejisamuzek.weebly.com/uploads/1/3/4/6/134636520/zoguguboloxagafaze.pdf
    • https://site-1172822.mozfiles.com/files/1172822/21686551936.pdf
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5fa7c2e36100e.pdf
    • https://cdn-cms.f-static.net/uploads/4374022/normal_5f989d179eec3.pdf
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/dcedadf33.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c9.bin
dc2a56168b21472f74ea2a14d5c5988079869c82d22c45a8cc984e636b45e09e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 5668 bytes
font_01_sfnt_off000105e2.bin
e5cadec34272236bb45266f29a6345ac8b2935901d3344ddbc1e6ae78a0b0ede		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 10804 bytes
font_02_sfnt_off00012af2.bin
5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF2 16060 bytes

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