Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b08308ff5870e8b…

MALICIOUS

PDF

87.8 KB Created: 2021-01-23 11:38:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd67f882ab2672b7b35255de825796a9 SHA-1: dd12909f46839354b85dc6513c012179d7fe7542 SHA-256: 1b08308ff5870e8bd2ae95139b68f5fe76346b4ff556c69dfd3800738a296562
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to potentially harmful content. The document body is heavily obfuscated and appears to contain metadata rather than user-readable content, further supporting a malicious purpose.

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://traffset.ru/aws?utm_term=bihari+gana+video+song
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5fcb667056a88.pdf
    • https://site-1202150.mozfiles.com/files/1202150/tinofewuzubup.pdf
    • https://site-1176597.mozfiles.com/files/1176597/music_download_free_mp3_songs_app.pdf
    • http://jofufuzutaki.22web.org/martha_stewart_luxury_flannel_sheets_cal_king.pdf
    • https://site-1178235.mozfiles.com/files/1178235/mr_love_queen_s_choice_victor_anime.pdf
    • https://static.s123-cdn-static.com/uploads/4476140/normal_60023f09144bb.pdf
    • https://static.s123-cdn-static.com/uploads/4372980/normal_5fcbb87f702eb.pdf
    • https://site-1188839.mozfiles.com/files/1188839/dvt_treatment_guidelines_australia.pdf
    • https://degubazof.weebly.com/uploads/1/3/5/3/135304991/nedifu-vusika-sunojojofatir-masebapelov.pdf
    • https://site-1171417.mozfiles.com/files/1171417/plex_client_for_ios.pdf
    • https://site-1179801.mozfiles.com/files/1179801/wwe_supercard_multiplayer_card_battle_game.pdf
    • https://site-1171990.mozfiles.com/files/1171990/health_and_wellness_coach_certification_programs.pdf
    • https://site-1175310.mozfiles.com/files/1175310/jukipevo.pdf
    • http://dixurujisefumet.22web.org/jomawadubexaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pakafadudu.epizy.com/39779515166.pdf
    • http://kirigawegugava.epizy.com/i_love_you_3000_ii_piano_sheet.pdf
    • http://kuwoguki.epizy.com/39058756472.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bd7.bin
37de17b13027b63bc0a4e5b749e55f960aa9d080fb5ac5f5d7bf6a7f63215208		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD7 5164 bytes
font_01_sfnt_off00012d6c.bin
51688075e908e0cf8240d6fc08fb5456e83a2264a3c0566d3895f25d25ba8433		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6C 10892 bytes

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