Malicious PDF — malware analysis report

Static analysis result for SHA-256 667a8e75fa3308d3…

MALICIOUS

PDF

89.5 KB Created: 2021-01-13 05:42:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 06b18bc391f6aabbbf27fab9bb062381 SHA-1: c21311a949c227ddb59ee7ee4893fb259f1379d1 SHA-256: 667a8e75fa3308d332a6e0519ed916f9b1e466f826b6ad92f2cd3e8733d1b78c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It contains numerous embedded URLs, with a primary external URI pointing to 'traffset.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of external links implies an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=criss+cross+in+the+wrong+direction PDF link annotation
    • https://site-1175696.mozfiles.com/files/1175696/wallpaper_ios_7_iphone_x.pdfIn PDF document text
    • https://site-1176684.mozfiles.com/files/1176684/26271670309.pdfIn PDF document text
    • https://site-1176887.mozfiles.com/files/1176887/dungeon_of_weirdos_apkpure.pdfIn PDF document text
    • https://site-1167942.mozfiles.com/files/1167942/proxima_centauri_b_gravity_compared_to_earth.pdfIn PDF document text
    • https://site-1173634.mozfiles.com/files/1173634/27639457011.pdfIn PDF document text
    • https://site-1201036.mozfiles.com/files/1201036/39315095732.pdfIn PDF document text
    • https://site-1178057.mozfiles.com/files/1178057/bombay_movie_all_ringtone.pdfIn PDF document text
    • https://fajubixinusejeg.weebly.com/uploads/1/3/4/8/134850070/pifepoxe-vidulamovago.pdfIn PDF document text
    • https://votokivefanatu.weebly.com/uploads/1/3/1/4/131453133/kaguwebemuwuwex_sajinafafuvupe_zalulotedas_wonudemoviri.pdfIn PDF document text
    • https://site-1166051.mozfiles.com/files/1166051/eight_planets_around_the_sun_rhyme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5f893ade995d1.pdfIn PDF document text
    • https://site-1172679.mozfiles.com/files/1172679/european_rowing_championships_2020_results.pdfIn PDF document text
    • https://tematurulabi.weebly.com/uploads/1/3/1/6/131606540/7986874.pdfIn PDF document text
    • https://site-1166598.mozfiles.com/files/1166598/40329252080.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nevovumowa/colorectal_cancer_screening_guidelines_australia.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E3 4860 bytes
SHA-256: 4696e3eec6e5f6407d80c521c781dafc05b89a18e64a6e886df6393c2d08e7e9
font_01_sfnt_off00012171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12171 12784 bytes
SHA-256: 630e7f4fa948d4505c640abcfd31005ec2e71540cc185eea60ae64ae276ac0bb
font_02_sfnt_off00014ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC5 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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