Malicious PDF — malware analysis report

Static analysis result for SHA-256 128afe853ff9ba95…

MALICIOUS

PDF

76.4 KB Created: 2021-03-04 12:53:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ac763849997385c5b67a2660c9842ad5 SHA-1: 755a805392a188f1ae021975da08f79c23c2664a SHA-256: 128afe853ff9ba95a92fa6880c6150f866f9a306f439e1a6af6c5bc1b45c5cef
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains keywords related to a camera manual, likely a pretext to trick users into visiting the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/wix?keyword=canon+elph+170+is+manual+pdf PDF link annotation
    • https://faxusonugavipil.weebly.com/uploads/1/3/4/7/134741565/2126858.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/bolexutibe.pdfIn PDF document text
    • http://istlan.space/gagavomonatifajajumurovepsegyi.pdfIn PDF document text
    • https://tuzidatawuno.weebly.com/uploads/1/3/4/9/134902979/bemuvedadeweferilu.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/jimexa2z7uj.pdfIn PDF document text
    • http://jirazabewofi.22web.org/51227182349.pdfIn PDF document text
    • https://lofemeraj.weebly.com/uploads/1/3/2/8/132814933/madalifu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pulutugorivexek.atwebpages.com/zunipike.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/aceites_esenciales_guia_de_referencia_gratis.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/faketimaridivepikuzexok.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/hotpoint_aqualtis_8kg_washing_machine_manual.pdfIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/gawibo.pdfIn PDF document text
    • http://zumoriko.epizy.com/tufuleluvixiwunijisupugix.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DF 5364 bytes
SHA-256: b0362b25ccb2ed9c54af135f5babd99c3e3d9149d56794b86d022081059e7b51
font_01_sfnt_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 15480 bytes
SHA-256: 463566841cb39981a95875470f6b5200fdf317203f0f55a24f5cd6e28d7d9c3e

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