Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd49fbfbba139ae…

MALICIOUS

PDF

62.1 KB Created: 2021-01-13 07:03:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7f9b7996e52b0d80a5f30b5d05831ab2 SHA-1: dd00b82051ddecae7b5951c73e19669d8e716c1f SHA-256: 3dd49fbfbba139ae4ef1366d89ee02cfe1790273cd6c676ff3a8ff6eb8176148
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one specifically pointing to 'trafficel.ru', suggesting a phishing or malicious content delivery attempt. The presence of multiple links on disposable hosting also indicates a link farm tactic, common in phishing campaigns.

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://trafficel.ru/123?utm_term=vector+addition+worksheet+answers+the+physics+classroom PDF link annotation
    • https://site-1171825.mozfiles.com/files/1171825/cover_fire_offline_shooting_games_for_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482218/normal_5feb4b8c1c9e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425491/normal_5f98ec7bc60cf.pdfIn PDF document text
    • https://site-1174310.mozfiles.com/files/1174310/vewafupisimusobewe.pdfIn PDF document text
    • https://site-1187516.mozfiles.com/files/1187516/how_to_draw_gacha_life_characters_girl.pdfIn PDF document text
    • https://cdn.sqhk.co/rowalulo/jgjjage/35602238132.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408596/normal_5fc3cc6723d25.pdfIn PDF document text
    • https://site-1168101.mozfiles.com/files/1168101/40629822887.pdfIn PDF document text
    • https://site-1174627.mozfiles.com/files/1174627/terabebonud.pdfIn PDF document text
    • https://site-1176758.mozfiles.com/files/1176758/tamil_new_movie_mp3_songs_free_download_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482009/normal_5fd832c087710.pdfIn PDF document text
    • https://site-1178820.mozfiles.com/files/1178820/first_rugby_league_game_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403140/normal_5fc5caef8f8d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bubeto/34837455678.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/30817660940.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_off0000b4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D4 5536 bytes
SHA-256: ebeee421082112490473e4b81e54c247ac385e6df9e4713fa225288e55d5ac34
font_01_sfnt_off0000c7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A0 10464 bytes
SHA-256: ee1ab9f77a5dc2317ae8c46b0e323b95abc0001ff605931733958882491b40b2

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