Malicious PDF — malware analysis report

Static analysis result for SHA-256 372509e82bf740b2…

MALICIOUS

PDF

78.0 KB Created: 2021-02-20 13:56:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4562fd4a4c4755fcd05a94bd187b639 SHA-1: 77b00b5b468b41f682c2b5bc94d1ae554f56c34c SHA-256: 372509e82bf740b240eeb8ecf5c8a350591141c3a30a26b023e3a79a2bb6fe66
126 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to updating TV firmware, aiming 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://crophysi.ru/strik?utm_term=how+do+i+update+my+vizio+tv+firmware
    • https://semuzotefol.weebly.com/uploads/1/3/1/4/131437619/2036533.pdf
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/9469624.pdf
    • https://cdn.sqhk.co/xejoxoka/Ejjogcb/jivetozesekuzitovusezexa.pdf
    • http://patavitukazinaz.iblogger.org/anselmo_ralph_songs.pdf
    • https://cdn-cms.f-static.net/uploads/4461525/normal_602169c524232.pdf
    • https://cdn-cms.f-static.net/uploads/4448103/normal_60143378778a5.pdf
    • http://trendmobile.ru/69807860005wnroo.pdf
    • http://skywonder.space/82848221091zyx2y.pdf
    • https://jebelobuf.weebly.com/uploads/1/3/1/4/131452997/dobemesaxil.pdf
    • https://cdn.sqhk.co/mifigatira/rhhvIii/doomer_talking_to_girl_meme.pdf
    • http://endi-itali.space/distribucion_de_poisson_ejercicios_resueltosnbpw1.pdf
    • https://rajagoka.weebly.com/uploads/1/3/1/4/131406288/rojelo_wibetunifizedu_fimaremegopi_reliradu.pdf
    • http://fixmarker.fun/51947545408lnf9b.pdf
    • https://cdn.sqhk.co/xotosobupis/fZ2iehe/gun_idle_mod_apk_2019.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vunefukovamin.rf.gd/festool_router_guide_plate.pdf
    • http://dadojusox.epizy.com/ayyappa_harivarasanam_ringtones_free.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_off0000f3ff.bin
9d8999630aca531fe29e0225d491346f97ce4abaf6cf2943f198c11f1b0c0617		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FF 5244 bytes
font_01_sfnt_off000105eb.bin
79c09de27ee99eee53fd1effb76af3c05dcb85b66472efea33c4cd3cc516e1a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 10704 bytes

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