Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af615587ca9a3a6…

MALICIOUS

PDF

77.8 KB Created: 2021-05-04 01:39:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d4278c30f1b7ba9cd8fff7d18739e81c SHA-1: 7bc86db035a0fb47d2ed918de4735aa46209f9d3 SHA-256: 5af615587ca9a3a6ac3e859a515172957845bef00ae489ef99e8c64b49380a0a
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, with a primary suspicious URL being https://soxebez.ru/strik. The PDF's structure and embedded links suggest it functions as a link farm designed to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soxebez.ru/strik?utm_term=nutrition+data+taco+bell+chicken+quesadilla PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366028/normal_6015713890d35.pdfIn PDF document text
    • http://zotokes.iblogger.org/almighty_infinite_father_song.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzewekafan/g5Lhihj/strong_my_dark_diary_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/daborofus/hibBra3/29678421384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451355/normal_606427f96441c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470017/normal_60240f9d6551a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381302/normal_60485a26b3b86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402478/normal_600fe0e16df20.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/hib7ogx/can_you_ride_the_ender_dragon_without_mods.pdfIn PDF document text
    • https://cdn.sqhk.co/vumojakizaw/cheL3ja/94493203747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452193/normal_6052d4dc1dbfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481513/normal_60365c8c51ec4.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/c3HPjeD/pet_paradise_tallahassee_jobs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448992/normal_603eb6f9a90c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luwikomoxure.epizy.com/applying_for_a_job_cover_letter_template.pdfIn PDF document text
    • http://milasumumalun.epizy.com/energias_renovables_importancia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/196b877d-3167-48df-911a-bc10afb65e10/what_to_eat_on_keto_for_weight_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d618be-2a63-4b57-b3aa-6fb993758c52/european_sword_fighting_techniques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5bff846-5214-458f-82b3-8abc1bcbd3e8/dizume.pdfIn PDF document text
    • http://ropawowotog.epizy.com/military_ranks_philippines.pdfIn PDF document text
    • http://gagivipupine.epizy.com/runawerogiwan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8868e59a-6e3e-4fb2-99f2-79a65b71f04c/43696505643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c58d2e65-f359-40e9-a5c8-b67b141843ec/sururunasipapiwebeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d51f9984-1fcc-4537-aecc-fd4a800f3ea2/30468971027.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_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 5328 bytes
SHA-256: 109a3f5771ed542f7691c082f7f0c9801d53d74cacb6f6b2bda28b63372c508c
font_01_sfnt_off000101c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 11696 bytes
SHA-256: d6b29129466c5c50f11241042c6ba4c1c0a5634c79850fdc58e38b8549d6a1fd