Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55a89c627830669…

MALICIOUS

PDF

85.5 KB Created: 2021-03-18 19:57:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b7d34a1c23cc84ba1790f4600e382bf3 SHA-1: 5467a8e6993a633c76596b6d21909ee0cf05544d SHA-256: f55a89c6278306690a89f3c34c15f0c54fdd3c4fbe9779352f973161189d8423
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://druttle.ru/strik?utm_term=2012+hyundai+sonata+starter+motor PDF link annotation
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/rajuku.pdfIn PDF document text
    • http://tcerkovniekupola.space/enter_the_kettlebell_or_simple_and_sinisterb7jl3.pdfIn PDF document text
    • http://organic-ita.space/xipanugidefuzujewuduwoguzgk3fx.pdfIn PDF document text
    • https://fuketuxe.weebly.com/uploads/1/3/4/4/134495293/jutufa-remivuluz-noxanuda.pdfIn PDF document text
    • http://khareedforosh.com/gepevurajaladefuguwf371.pdfIn PDF document text
    • http://xutarima.22web.org/coal_bag_osrs_guide.pdfIn PDF document text
    • http://jokebixa.22web.org/wakovaguvusurorozu.pdfIn PDF document text
    • https://vipomumukewa.weebly.com/uploads/1/3/0/8/130813786/rizarozogufot.pdfIn PDF document text
    • http://nuzovofevaduw.22web.org/74583075261.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1ad9eb7-3247-4adc-b4ce-d604b6ab010a/does_mind_power_workshop_sneh_desai.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/swing_low_sweet_chariot_sheet_music_choir.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/35828981595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1fba233-a3f6-42cb-b3d9-f2c8509d9af6/sole_f85_treadmill_disassembly_for_moving.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc7ab4c3-93fc-423d-8a89-09090f792ecc/92749916864.pdfIn PDF document text
    • http://sasugokomelu.rf.gd/how_to_program_cuisinart_automatic_grind_and_brew_coffee_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a373bab-b868-45be-9f3b-a8ccbb8cd5c8/jaluvike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c15d83f2-3f2b-4b58-b691-76b7ad21f388/how_to_find_a_slope_with_two_points.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f7be7f0-0193-44d8-8da3-0ecb6e3783c3/liftmaster_error_codes_12_flashes.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/ant_design_form_tutorial.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF851 5364 bytes
SHA-256: 29b358af57480d10883973626f76d124280d5809dfe82ff349d6c9f7e0234f01
font_01_sfnt_off00010a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 11752 bytes
SHA-256: dd46a9ddb5d236274b119961d99de161d11534792651fb1bf4f6e0e4ff8b64d8
font_02_sfnt_off00013292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13292 16392 bytes
SHA-256: 4fd8ce0a0bd469555a02c303bb9ce5733de29ec9beb10c576de77aa505f32037