Malicious PDF — malware analysis report

Static analysis result for SHA-256 70aa67a766286d55…

MALICIOUS

PDF

78.9 KB Created: 2021-05-13 23:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bf9d8847c5b77d16027d306a7524d58 SHA-1: 7a29cb70d094a0c6577e9aa81caf3e4f651129e8 SHA-256: 70aa67a766286d55628d4fbc5e8ed19711159ec948b8d9d44843e9864d289a46
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with a primary one pointing to 'dafemum.ru', suggesting a phishing or malware distribution lure. The presence of multiple links on disposable hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dafemum.ru/strik?utm_term=canon+mp250+how+to+scan
    • http://okrasote.info/zemonifaromegewawavxti8e.pdf
    • http://gipovasota.sportsontheweb.net/29497976568.pdf
    • https://cdn.sqhk.co/kipaselofuza/Ljahdhh/spider_trouble_mod_apk.pdf
    • https://cdn.sqhk.co/soziwariru/ahgukyu/vawafukabonobukakaxiv.pdf
    • https://cdn-cms.f-static.net/uploads/4422137/normal_60312d5f55a24.pdf
    • https://cdn-cms.f-static.net/uploads/4482636/normal_6014dd15d149e.pdf
    • http://rijexofugovu.medianewsonline.com/50769769057.pdf
    • http://xolokukifimiv.sportsontheweb.net/how_to_take_apart_cast_iron_fittings.pdf
    • https://cdn.sqhk.co/fagiseregu/gTjdhja/52708677543.pdf
    • https://static.s123-cdn-static.com/uploads/4366015/normal_5fde1942bb37c.pdf
    • http://websecurer.tech/watchos_6_slowxq7my.pdf
    • https://cdn.sqhk.co/favosejo/iibhegd/jokawu.pdf
    • http://megatorg.ru/my_holmes_tower_fan_stopped_workingxcd7w.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2efabd41-1f95-43d0-8245-5f8eb9267247.filesusr.com/ugd/2f4ddf_ba12e84f64954d948faf10b976b19e76.pdf?index=true
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_8a24288b6739437dab34a813f0b4c14e.pdf?index=true
    • http://wenulusevikofa.myartsonline.com/51795590717.pdf
    • https://s3.amazonaws.com/jusagi/what_are_some_good_research_topics.pdf
    • http://zewadomi.myartsonline.com/26556595793.pdf
    • https://s3.amazonaws.com/xuzakob/wejero.pdf
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_9c04c23d5b8a4255bac5294b17151e94.pdf?index=true
    • https://s3.amazonaws.com/setaxilitozuko/99358633886.pdf
    • https://s3.amazonaws.com/gotitibekovi/jesagafupudusa.pdf
    • https://s3.amazonaws.com/fumiposamisur/ziwud.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_off0000f67d.bin
94b5e2adecd03e162ace14ee7b57cdbb7bb3753556a3b90502e2297622b9157b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 5440 bytes
font_01_sfnt_off000108f2.bin
cbcec4a26d3ed5de67070f326770cc64b18f5d29bd1691f96721f2b726d565be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 10836 bytes

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