Malicious PDF — malware analysis report

Static analysis result for SHA-256 11df047b09160399…

MALICIOUS

PDF

70.7 KB Created: 2021-01-11 22:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ae73b1307017f20e4c2e56537cefab95 SHA-1: 5232757e06dc26e781b3f6663a33dc05f3c49eb7 SHA-256: 11df047b09160399a2e36964e3a1b3d127f6f890f25a898e61ba100c73e9df9e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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, with one prominent URL pointing to 'traffset.ru', suggesting a redirection or phishing attempt. The document body, though heavily corrupted, contains text that appears to be a song title, likely used as a lure to entice users to click on the malicious links.

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/aws?utm_term=billi+akh+prabh+gill+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5f9588a803d36.pdfIn PDF document text
    • https://site-1167961.mozfiles.com/files/1167961/snappers_st_pete_beach_nutrition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419633/normal_5faab4545bb8b.pdfIn PDF document text
    • https://site-1176489.mozfiles.com/files/1176489/kikudugip.pdfIn PDF document text
    • https://site-1197344.mozfiles.com/files/1197344/rolling_stone_magazine_top_500_albums_2012.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5f89fedf43331.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368969/normal_5ff15b1a2cd92.pdfIn PDF document text
    • https://site-1173386.mozfiles.com/files/1173386/94542535503.pdfIn PDF document text
    • https://cdn.sqhk.co/pomiwuximu/jbTiilK/wukezafarevop.pdfIn PDF document text
    • https://site-1172079.mozfiles.com/files/1172079/hisd_calendar_2020-_21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373502/normal_5fce28ece17f1.pdfIn PDF document text
    • https://cdn.sqhk.co/fenajobuwer/Kghjjja/60317555078.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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_off0000ca4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4E 5332 bytes
SHA-256: 9402308b0cd5435584eaa7bce5384952299583f154dc354ae26abad610b5bf09
font_01_sfnt_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 2952 bytes
SHA-256: ec6ec88ca69bf4a2d385f268f7c3476703fea29488cf475d9a5ef5f612bab5f5
font_02_sfnt_off0000e8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 11000 bytes
SHA-256: 96aac26d1921a644b18c55f3b4ea9c3c22062b58d098454ae6af0995d7196b80

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