Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b29525d3de2153e…

MALICIOUS

PDF

73.6 KB Created: 2021-04-07 15:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e30da1926c1ce4e484b00c4d3869929c SHA-1: 4426ae9d55ea35d15f68bc669a37c16431436941 SHA-256: 5b29525d3de2153ed4dad0b00a92f77072aa9971f26f75212cee4b336eb2421b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9965

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 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://jottigo.ru/award?keyword=manual+de+auditoria+y+revisoria+fiscal+pdf PDF link annotation
    • http://malespw.xyz/malusivth44n.pdfIn PDF document text
    • http://shoop-fl.ru/dyson_dc28_animal_replacement_partsoq032.pdfIn PDF document text
    • http://powerhdniy.space/diccionario_ingles_espaol_larousse4i5bj.pdfIn PDF document text
    • https://cdn.sqhk.co/kekumumaxow/1ijigrE/106249121.pdfIn PDF document text
    • http://myirn.icu/what_is_mischief_rule_of_statutory_interpretationks1ce.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/applied_electromagnetics_stuart_m_wentwortha3hlv.pdfIn PDF document text
    • http://lazadacostumercenter.com/nakalefebuvikisodusirexavvp935.pdfIn PDF document text
    • http://file-id.ru/768300546437n60s.pdfIn PDF document text
    • http://habirovradik.ru/how_to_pair_plantronics_plthl08p.pdfIn PDF document text
    • https://cdn.sqhk.co/zoraxiraga/8Ghathk/vizio_sound_bar_mounting_template.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/8bc5a1b5-e3b6-4564-bf46-163de14118c5/23629093290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f96e75-3b7d-45e3-a788-29eb14f34bac/sony_str-dh750_best_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87c87d7c-a2a4-4774-8fcf-b12fe39263a4/serupodijogimevaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/479ef848-bfd1-4540-8ba0-a875b447237e/john_deere_lawn_tractors_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d91c5987-9ea0-420d-9f1f-3f212dc86688/attack_on_titan_manga_release_date_134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5901f8f-38cc-4079-bb6e-8201039dee00/6_step_sequencing_worksheets.pdfIn PDF document text
    • http://folezazav.epizy.com/gevejeni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c16007f-457e-46dc-91fa-8e06b2dfe1c9/ziruguwinuvanij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20012e77-640d-466c-b768-d37e230eb335/is_there_magic_in_the_lies_of_locke_lamora.pdfIn PDF document text
    • http://fopopuwefepa.rf.gd/spelling_test_template_20_words_free.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 5316 bytes
SHA-256: e58854f1a3ffd44ad9938700f8c79f6d6cc3b890bfe640a4246ea2f6dc4f0702
font_01_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 11764 bytes
SHA-256: e3aeb700b2dd774e4c5a3fe6c080eac9283ebfdaf381e2e18846b81f2c5d72dc