Malicious PDF — malware analysis report

Static analysis result for SHA-256 2801c884a69fe510…

MALICIOUS

PDF

83.6 KB Created: 2021-02-18 19:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c8b2e7f23d17200f4c96d5fdcb871185 SHA-1: 35466c7608a0c3615fb0bc5462d7ed9e9902f701 SHA-256: 2801c884a69fe510f28a43eacf0758b0f6a85b24f51c6d2928a1b91e5f68740d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to be a lure related to a device manual, intended to trick users into visiting these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=alcatel+one+touch+pixi+4+manual PDF link annotation
    • http://kyukty68.xyz/segurana_em_tecnologia_da_informaokmmdz.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/MRmHmih/75024065404.pdfIn PDF document text
    • http://sq11mini.com/forigewxjlqp.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/minitoon_car_racing2bwpw.pdfIn PDF document text
    • http://xruhdfo.site/monolithic_structure_of_operating_systemaod11.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/ZFhj5pW/ultimate_robot_fighting_mod_apk_android_1.pdfIn PDF document text
    • https://vupixesit.weebly.com/uploads/1/3/2/7/132740805/d9139b4a8.pdfIn PDF document text
    • https://nupafosudivoz.weebly.com/uploads/1/3/2/6/132682156/dezowukikoluru.pdfIn PDF document text
    • https://tedarotola.weebly.com/uploads/1/3/1/4/131482933/2fbc92.pdfIn PDF document text
    • https://kaguleturega.weebly.com/uploads/1/3/4/9/134904612/demaxemela-setapir-tuxunosapu.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/1316667095gn8lk.pdfIn PDF document text
    • http://rovepofaji.22web.org/48987513640.pdfIn PDF document text
    • http://jsexj.fun/7010b_double_din_manualfg22r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nizamazibenu.rf.gd/ignou_b._ed_books.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 3724 bytes
SHA-256: 0bc2187513754c209a1ff1b79f120b31e782b370bd3c40d674ca37d1cde5bce0
font_01_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 5044 bytes
SHA-256: 7b06fa25ce9f10f7e49065725ed44f3f38cbeda85538708818b253e48c0361e0
font_02_sfnt_off000114e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E1 2048 bytes
SHA-256: d315631624845d767e8eefb1c373e4e883a0eb50fe06d181f9ec891ada23e59a
font_03_sfnt_off00011dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBE 10184 bytes
SHA-256: 15d5091334b1814e4c0b051429256e157b0fb3bbc17b0c1cee71320598a460ae

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