Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f651efdeaf20115…

MALICIOUS

PDF

75.2 KB Created: 2021-06-03 14:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73bb9a04cb15174f9dcf8086ee50c472 SHA-1: 7a857b7cbb777f4bb3589a020dc1fc311a98ace9 SHA-256: 6f651efdeaf20115e5d0ac5637fce6811b57ea7c59d899bc5fb297446a79c357
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, suggesting a link farm or phishing attempt, with the primary lure being an 'employment reference letter template'. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs indicate an attempt to redirect users to malicious or deceptive content, likely for phishing or malware distribution.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/pbw?utm_term=employment+reference+letter+template
    • https://nekitunanozot.weebly.com/uploads/1/3/5/3/135346928/semedotudav.pdf
    • https://cdn-cms.f-static.net/uploads/4420765/normal_6009e84d8bc3f.pdf
    • https://xovipapapili.weebly.com/uploads/1/3/0/8/130873893/roxinuvanusukami.pdf
    • https://rojukekodeb.weebly.com/uploads/1/3/4/6/134682316/gagede.pdf
    • https://cdn-cms.f-static.net/uploads/4495975/normal_6060f952b470c.pdf
    • https://pabarasoziraw.weebly.com/uploads/1/3/5/3/135324669/butanakesawixif.pdf
    • https://letenusesek.weebly.com/uploads/1/3/4/3/134310332/1729256.pdf
    • https://nijusalelazi.weebly.com/uploads/1/3/4/8/134875584/mivoke.pdf
    • https://jukirabupunux.weebly.com/uploads/1/3/0/8/130874410/zuxiru.pdf
    • https://jewanulak.weebly.com/uploads/1/3/4/3/134305347/5972629.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ac934dbf-be34-42e7-8e70-45644023144f/photosynthesis_in_a_plant_leaf_model_answers.pdf
    • http://fatakalewene.pbworks.com/w/file/fetch/144501471/hisense_air_conditioner_remote_instructions.pdf
    • http://dejimebez.pbworks.com/w/file/fetch/144420747/will_crash_team_racing_nitro_fueled_be_on_pc.pdf
    • https://uploads.strikinglycdn.com/files/6324ba56-0aee-4cd3-93c4-e758a048fce5/apc_es_550_data_cable.pdf
    • https://uploads.strikinglycdn.com/files/ea9c2aae-d11e-4c71-8679-77b5097110c0/gimp_software_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/b8c7a149-162c-4ace-a1bc-9a6cf3101d87/what_ink_does_hp_deskjet_2545_use.pdf
    • https://uploads.strikinglycdn.com/files/733dd7c0-75f2-443b-b7ff-348268a9bf3c/call_of_duty_cold_war_xbox_one_beta_release_date.pdf
    • https://uploads.strikinglycdn.com/files/1eb340a9-079e-49cc-8010-7fffb49df189/combination_circuits_worksheet_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/56ccca20-38db-45bb-9204-fd41e725f9ee/41841147261.pdf
    • http://lagawiwefe.pbworks.com/w/file/fetch/144529281/srimad_bhagwat_geeta_in_odia.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_off0000ea94.bin
332016bb4702df309fc21a3e34267686764244ed3c4148ddc6ff9fdd81a80e83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 5044 bytes
font_01_sfnt_off0000fbb7.bin
42b2c93a2d1c0b4b8dc0d9c0679a89a1bf57f051cdafc374f312ec79de341746		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB7 10392 bytes

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