Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ff9f8689f2afa1…

MALICIOUS

PDF

76.1 KB Created: 2021-03-01 19:31:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 76afff41605ba304637d467c7ed953d1 SHA-1: 9271e7822b2c62471fb97810dac57168dca75a6e SHA-256: a5ff9f8689f2afa16a035af7161aeffff8066aea86f866b575de6fec3accf36d
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 external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though partially corrupted, contains a keyword related to 'sims 4', likely a lure to entice clicks on the embedded URLs.

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://jacksth.ru/award?keyword=how+to+remove+curses+sims+4 PDF link annotation
    • https://vabusidi.weebly.com/uploads/1/3/4/7/134765039/lasezoponunig.pdfIn PDF document text
    • https://lomofatawepap.weebly.com/uploads/1/3/4/5/134599642/f0ade75fb7dc.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/multi_line_cordless_phone_systems_small_business.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500667/normal_5ff16d2f39a7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446643/normal_5fca2d4ec9c21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416144/normal_5fe3c403635b1.pdfIn PDF document text
    • http://vipmanmarket.space/jasazebiboxozedkbw9.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/relation_between_electric_and_magnetic_field_in_em_wave.pdfIn PDF document text
    • http://portkamesto.site/autocad_architecture_2016_tutorial_free_downloadf9mlm.pdfIn PDF document text
    • http://levotavo.scienceontheweb.net/84529314373.pdfIn PDF document text
    • https://sizokagijabid.weebly.com/uploads/1/3/4/6/134652394/xodeva.pdfIn PDF document text
    • http://fosavaxenu.mypressonline.com/44550075249.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kavibajegis.onlinewebshop.net/miller_bobcat_225_nt_welder_cover.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/xokovixu.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_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 4904 bytes
SHA-256: 6173752fc90cffbbfec45626b44cc044c13b6bb1b5ebf0e2b9fd9ccfe21874ee
font_01_sfnt_off0000fed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 10704 bytes
SHA-256: 103876466bbc95dfee15a99c99c212c4ae6e0966dfeaa2d29d0527b51e34653e

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