Malicious PDF — malware analysis report

Static analysis result for SHA-256 6753f4cd1d08524b…

MALICIOUS

PDF

81.4 KB Created: 2021-04-07 00:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffab14a8bd2a169aa55c1d9632feb244 SHA-1: 31a9d39a1040cae7fecdf4d77ce1320138058785 SHA-256: 6753f4cd1d08524b3f18edf5bbe080b301e96ae723fc0c9ad5816a3f2afa9d86
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are on disposable hosting, indicating a link farm designed to drive traffic to potentially malicious sites. 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 embedded URLs point towards a common tactic of luring users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-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://zajinet.ru/strik?utm_term=clases+de+ingles+on+line+gratis+con+audio
    • http://varietystore.website/elements_of_music_dynamics_definition9203w.pdf
    • http://zozavelomidabi.scienceontheweb.net/xejatonese.pdf
    • http://lonukujimatulo.iblogger.org/wajevulovugoladigi.pdf
    • http://tafuxasomup.getenjoyment.net/92578977048.pdf
    • http://nutristrike-shop.ru/what_is_social_psychology_in_psychologyvyt5p.pdf
    • http://nivawegokex.22web.org/cambridge_dictionary_grammar.pdf
    • http://b2b-servis.ru/can_you_use_a_gopro_hero_3_as_a_webcammzvfl.pdf
    • http://winoorama.site/tugigoxesdc5r.pdf
    • http://sumidabitax.iblogger.org/bronkopneumonia_pada_anak_adalah.pdf
    • http://toppiksnack.xyz/20173317133jxn9n.pdf
    • http://figimumagoko.mygamesonline.org/job_skills_assessment_test.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_7e6d2c869bdb405a99bc9675f7dcf345.pdf?index=true
    • https://b8f7bc2e-5f90-466c-a76c-b8215bfdb3ae.filesusr.com/ugd/9717d9_44c075cd6ff34c09b80ad604d1e099d2.pdf?index=true
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_a3929ba67c834f1db2649cf3a76401ba.pdf?index=true
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_091b622f561f4193ad1c97801546a2cb.pdf?index=true
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_12cf94a2a9a74ee6b99a5cd7dc0dc10f.pdf?index=true
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_69af0384d35d460e9f8b73e2578a1d5f.pdf?index=true
    • http://rukosivujuxu.atwebpages.com/ge_profile_spacemaker_xl1800_charcoal_filter.pdf
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_38cb7b1b647544118672459d542ef602.pdf?index=true
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_4f4a12363ae142b4a8f6711c411f200a.pdf?index=true
    • http://jajumuxepuj.rf.gd/maya_angelou_birthday_wishes.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7b0.bin
dc04a84eb37531a10bab5a9f98376bbc1d521595c810a763b57f8680421d17e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B0 5012 bytes
font_01_sfnt_off0000f8c7.bin
4a64ea49902bb86bb9dc418f769e718412361fadea9d813793a7f3153ca42378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 12280 bytes
font_02_sfnt_off000120d8.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120D8 16204 bytes

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