Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bc62d31a5c9e74…

MALICIOUS

PDF

76.3 KB Created: 2021-02-11 16:20:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 550121caa86f6c2b72502464d81ae19b SHA-1: 7c97f381ef1c71efb3f0e2da0c6cae55394a6b18 SHA-256: 92bc62d31a5c9e7461921c2e12a55605873600455b69c15ef6ebe8746f9a46dc
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains or link farms, indicating a likely attempt to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=netgear+wgr614+manual
    • https://cdn.sqhk.co/fegukajebaj/djajcKd/viral_sport_tv_apk_2._0._8.pdf
    • https://cdn.sqhk.co/nopawuwam/McH5Pgj/81428704528.pdf
    • http://vizionsmc.net/badiparipozagisabupo621y9.pdf
    • http://douchehq.xyz/341825413621xlxp.pdf
    • https://popajilosofov.weebly.com/uploads/1/3/0/7/130776408/8785682.pdf
    • http://gamedv.design/super_smash_bros_nds_rom_hack5xl47.pdf
    • https://cdn.sqhk.co/mifijizudi/eihbies/pumevixupufutizibaneri.pdf
    • https://galidenik.weebly.com/uploads/1/3/1/8/131856819/jakepib-bezavegebomunex.pdf
    • https://gidedumewulo.weebly.com/uploads/1/3/5/9/135961218/240db8.pdf
    • https://static.s123-cdn-static.com/uploads/4423443/normal_5fc5d70871fe4.pdf
    • http://tiktoktop.design/carte_gaspsiezppbj.pdf
    • https://cdn-cms.f-static.net/uploads/4473049/normal_5fd218de93478.pdf
    • https://cdn.sqhk.co/zifuvifiweva/l1aIhgh/jojul.pdf
    • http://ygrash.website/46976521590v53t4.pdf
    • https://static.s123-cdn-static.com/uploads/4425209/normal_6000ed7bc77ec.pdf
    • https://cdn.sqhk.co/rufopunuk/5ihRjge/46445429696.pdf
    • http://loveantravel.xyz/cisco_anyconnect_4._6_linuxvn0an.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pisedij/40338220674.pdf
    • https://s3.amazonaws.com/wazotojemov/xifukopowipawurufowonujo.pdf
    • https://s3.amazonaws.com/fajeloninesitel/wepalipivel.pdf
    • https://s3.amazonaws.com/xilasisefi/3936715980.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_off0000eb34.bin
ccdf8aa2aefa596598ab322436675a6b6997575b4a2f12464ec0dc6e1a2faf63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB34 5180 bytes
font_01_sfnt_off0000fce6.bin
7960e2ecfd7df0c105aa1a1d783faa20988c32aac9f288d0b2b3a79ae0541ef4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 12052 bytes

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