Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa7efbbe2bed54e…

MALICIOUS

PDF

72.8 KB Created: 2021-03-03 20:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 49134df320705d2536a49f5f13e4c7e8 SHA-1: b4d1968adeeaf07f4d4d1ddaaf4afe9875b81b02 SHA-256: 6aa7efbbe2bed54ec1498e79a5d9b7f2422fc78130d9cba1be96d51fbc93598c
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on low-reputation hosting, likely to direct users to malicious content. No scripts were extracted, but the presence of external links is the primary indicator of malicious intent.

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://vilenefex.ru/123?utm_term=cessna+172e+service+manual PDF link annotation
    • https://divulonuwuw.weebly.com/uploads/1/3/1/4/131482828/foxikozuvunamis-tukomilajo-besikibudo-ladinipixemosi.pdfIn PDF document text
    • http://axecheat5.xyz/panasonic_lumix_dmc-fz2000_vs_fz1000_iix7932.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/teacher_created_resources_inc_answer_key7556b.pdfIn PDF document text
    • https://xudapunazegiwav.weebly.com/uploads/1/3/2/7/132741045/wobiw.pdfIn PDF document text
    • https://sojurepew.weebly.com/uploads/1/3/5/9/135992925/bd38a5bc6e.pdfIn PDF document text
    • https://cdn.sqhk.co/siboxowimu/aGgfXgc/38949623322.pdfIn PDF document text
    • http://twoup-viktoria.online/lego_lord_of_the_rings_character_listx8s8g.pdfIn PDF document text
    • http://usblighter24.site/brandywine_diner_menu9x3yp.pdfIn PDF document text
    • http://pressit.fun/190339552474bxtd.pdfIn PDF document text
    • http://copyrightnotice-ig.com/siforenitawulixzcwqp.pdfIn PDF document text
    • http://romeita.space/20516930745k9pb.pdfIn PDF document text
    • http://getbuiss.online/employment_certificate_letter_formatlna1s.pdfIn PDF document text
    • https://cdn.sqhk.co/tifomogoketu/ztVkLgf/58072031385.pdfIn PDF document text
    • https://cdn.sqhk.co/salijuvam/5EjfKjf/elemental_dungeon_1._1_apk_mod.pdfIn PDF document text
    • http://legendnat.space/jadavetapapexigilorrzrzs.pdfIn PDF document text
    • http://about-igsupport.com/71721592062ryqo6.pdfIn PDF document text
    • http://wejesigozolireb.getenjoyment.net/lonet.pdfIn PDF document text
    • https://norabemomo.weebly.com/uploads/1/3/0/9/130969424/3321883.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 5172 bytes
SHA-256: bc17844e780447259368000952cef1c41fe140ae3c22e3ab40dbc700d1deccd4
font_01_sfnt_off0000f2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CC 10340 bytes
SHA-256: e2822da9154a6f0b4847125b34e6f7a352651b9a147c4e81d03c40115288da14

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