Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12a5bfeae289332…

MALICIOUS

PDF

74.6 KB Created: 2021-03-06 15:14:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 074d5ffc2db170e1601e2b21a6b54ad1 SHA-1: 2cb7835f16548f2d0a8222f1d3edf626ed18d567 SHA-256: a12a5bfeae28933268b2c092bcffd7cde0c7e058416448c452a2021cade47a1f
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are dynamically generated and point to other PDF files, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/award?keyword=bayliner+245+parts+manual
    • http://astropsychology.website/pictoword_level_404sjnm8.pdf
    • https://cdn.sqhk.co/vifamepupib/G4ibkif/gidegifidogegotakeberix.pdf
    • https://cdn.sqhk.co/nalujujoso/ihavje1/furies_last_escape_wiki.pdf
    • https://cdn.sqhk.co/nogorodizet/g4jhBMV/stick_man_movie_netflix.pdf
    • https://static.s123-cdn-static.com/uploads/4425484/normal_5ff686a0d1c2d.pdf
    • https://cdn.sqhk.co/zogobadakedu/Xhdw3he/angry_birds_match_3._2_1_mod_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4410731/normal_60000cef4ef3e.pdf
    • https://cdn.sqhk.co/nupopobax/WgjKhg4/rizuwesipevovulutifip.pdf
    • https://cdn.sqhk.co/zevinikiwi/DuXiiwE/tolemuwasigawimag.pdf
    • https://cdn-cms.f-static.net/uploads/4471234/normal_6038749aebbc0.pdf
    • https://cdn.sqhk.co/fagiseregu/7ihnjg6/duzupubaxupawalo.pdf
    • http://hdsamara.ru/exogenesis_part_3_piano_sheet_musicka2j5.pdf
    • https://cdn.sqhk.co/rizuwevize/hghZ8gh/bubble_tea_delivery_new_york_city.pdf
    • https://cdn.sqhk.co/zasemewiti/jjajgxD/22889888058.pdf
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5fe94e49e505f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_a7e4b19a69f34ababa4a69959b7cdb45.pdf?index=true
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_159973a92fdd4da1ac0dc253933cb835.pdf?index=true
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_9b382c29130e4e8e9cc27b7ad0edae67.pdf?index=true
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_c1b4bc419f3d4293956494686b5f455d.pdf?index=true
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_aee3a361ba3942e789ef54048591dd12.pdf?index=true
    • 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_off0000e79c.bin
05cbe339d5e78d759b7f3c0a4fcb7c9fab08aadf8502cb8b0f0599ecd5696c99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE79C 5460 bytes
font_01_sfnt_off0000fa2f.bin
da58ca1cf46ec2c7f1746666130c2c6e6780559919f3d83d8b480e938e57df48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2F 10332 bytes

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