Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65b4f82866183b3…

MALICIOUS

PDF

104.1 KB Created: 2021-04-07 18:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e912d24d549adca0d279b22e706a250d SHA-1: 7c675f537a4d3d8c03b42b228bfd2ddb8582498e SHA-256: b65b4f82866183b39dc3ed3e6d4c9f4bb6dc55588e26fbd8a54c1f0c394e002a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were extracted, the sheer volume of external links points to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://golowaki.ru/strik?utm_term=personajes+principales+de+la+obra+don+juan+tenorio PDF link annotation
    • http://linefofaxugedu.mywebcommunity.org/pediatric_anesthesia_reference_sheet.pdfIn PDF document text
    • http://gejejasofubi.mywebcommunity.org/35850635645.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/33594095312.pdfIn PDF document text
    • http://fiwetud.scienceontheweb.net/49502736369.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vukusa/27791626787.pdfIn PDF document text
    • https://67dbe094-6b68-4a2c-870f-9bd980043d88.filesusr.com/ugd/cff74a_faa486a0490041b38cfbe27c31e06554.pdf?index=trueIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_51cac879dbaf4d4d9d7e79d8b76bedbc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/girlfriends_guide_to_divorce_trailer_season_2.pdfIn PDF document text
    • http://varirojemixu.myartsonline.com/small_fry_lisa_brennan_jobs_download_free.pdfIn PDF document text
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_3f742cd8395449d2ace696b7c0f7cabc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/susakilowobusot.pdfIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_f4576166e7c24232a67c51e35b4dee9a.pdf?index=trueIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_0c17984ee9384f31ad753fc8aa89f465.pdf?index=trueIn PDF document text
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_0f64790c9d854803b8b00189353865f1.pdf?index=trueIn PDF document text
    • http://sulijugofogim.onlinewebshop.net/history_of_the_world_in_100_objects_transcript.pdfIn PDF document text
    • http://forezepolutaju.onlinewebshop.net/what_education_is_needed_to_be_a_child_psychologist.pdfIn PDF document text
    • http://rupesujutiwu.myartsonline.com/34320882793.pdfIn PDF document text
    • http://tikimiwuwal.myartsonline.com/9648768699.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/fonupimiluwasamese.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_0a9e0e4bb72940649c1fc54191b3d4d7.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12850 2996 bytes
SHA-256: fd7ca904a086d7e4d4549ff606d429cf8a246d475548939133b0259e316ca2cc
font_01_sfnt_off00013313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13313 5168 bytes
SHA-256: 015e3cf4d41c96087b03165b8c4f1a7fc5a5320754da6570e0fe42196a9e8609
font_02_sfnt_off000144a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A9 12196 bytes
SHA-256: ebd2619768d7c8c510a61c81077079efc2b4b8f77928cd0caf23e4dbdf8d950e
font_03_sfnt_off00016c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C9B 16184 bytes
SHA-256: 76e20cc9bded8abe6e5a345e82ca3c73c42f8c2e079f3312f35f44d1d87cb749
font_04_sfnt_off000181d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181D7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f