Malicious PDF — malware analysis report

Static analysis result for SHA-256 751bc920d0ecb65f…

MALICIOUS

PDF

87.2 KB Created: 2021-03-23 01:29:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f67bf48c052fab6e03d7e1f578a83e4d SHA-1: 55e8e2efacc4ee1f0141cebc9f968e2aeda9ca90 SHA-256: 751bc920d0ecb65f0a319e2a14d7907dfd806d36434e50e205845161cb06f8bb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, directing users to various PDF files hosted on external domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/award?keyword=willpower+book+baumeister+pdf
    • https://cdn.sqhk.co/wadupaxi/jzxou0Z/pinball_skill_state_of_decay_2.pdf
    • https://cdn.sqhk.co/bikuloxisage/hhAjdja/kogivagurakukesemib.pdf
    • https://cdn.sqhk.co/lexaxemiji/gggjjiC/17359576686.pdf
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/6071801.pdf
    • https://cdn.sqhk.co/tokokoxisuf/he3VWSl/animals_movie_hd.pdf
    • https://rekoxexegatetun.weebly.com/uploads/1/3/1/4/131452740/9327095.pdf
    • http://tuimag.ru/hearing_impaired_cordless_phone_with_answering_machineu0rl4.pdf
    • https://tafevivif.weebly.com/uploads/1/3/2/6/132682704/wipofapujugag.pdf
    • https://foralesu.weebly.com/uploads/1/3/4/0/134096101/libemawozutibarexil.pdf
    • http://uscovidcharts.com/loripuxofumogigatogap0zq5l.pdf
    • http://starkrobotics.org/22955413503m6qh1.pdf
    • http://klosheff.xyz/lenumuluvufitobepurewqtsw.pdf
    • http://vsedlyatebya.xyz/52625065355uecrs.pdf
    • https://cdn.sqhk.co/noperizapewo/jjbeebk/oregon_trail_ios_app.pdf
    • https://cdn.sqhk.co/jefapukawore/dibjcme/polycab_cable_gland_selection_chart.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_8470c937731648a897dde8038cec58c9.pdf?index=true
    • https://651f5d5e-5f42-4fb0-8380-889764ca350f.filesusr.com/ugd/b2f7c1_b6dd54c092234cc8bc7652906322dfa1.pdf?index=true
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_a1caf5d05a2a49a4b53259755c69febb.pdf?index=true
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_e721a5e0f2d94e8882df87fae5188d71.pdf?index=true
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_f5b642bb8fd1480ca539492a0401c4a4.pdf?index=true
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_84d0f0c2801644c5b4bd6db61e99827d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010750.bin
9f98ba84fc5ca606e4b54d155545f9a6168bf08f57c80e0698ea356c6d0c95d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10750 5272 bytes
font_01_sfnt_off0001194d.bin
ebcf4363b1ad14456e36066843d77da0580c4b156a15b1bd9d395b1365366290		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1194D 11592 bytes
font_02_sfnt_off00014119.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14119 4324 bytes

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