Malicious PDF — malware analysis report

Static analysis result for SHA-256 8491950bd864318f…

MALICIOUS

PDF

71.7 KB Created: 2021-06-04 04:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5a1630126c2070e8c456c3f558b87139 SHA-1: 10ce99797fd24f1b5fa920a5591faf445314e67c SHA-256: 8491950bd864318f1cd54308d1519c545800deb511a55243ef8a0c6e2dbda40e
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 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/pbw?utm_term=transformation+geometry+slideshare PDF link annotation
    • https://kenometiwu.weebly.com/uploads/1/3/4/3/134340836/8325501.pdfIn PDF document text
    • https://luwamagol.weebly.com/uploads/1/3/4/3/134375262/f10f1.pdfIn PDF document text
    • https://zovigimezudisa.weebly.com/uploads/1/3/4/7/134725875/kukabidinozov.pdfIn PDF document text
    • https://mezonojasu.weebly.com/uploads/1/3/4/6/134639114/9b406610253.pdfIn PDF document text
    • https://favigexa.weebly.com/uploads/1/3/0/7/130738696/rojin-rozegapufomaw-lodinuxav.pdfIn PDF document text
    • https://koligopore.weebly.com/uploads/1/3/4/6/134605833/ponobufuloramor_jiwepol_dujon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465145/normal_605324bb549c9.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/7734554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500430/normal_602a7012cf86d.pdfIn PDF document text
    • https://sawasivived.weebly.com/uploads/1/3/4/3/134378202/7317106.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/90bd248f-291e-432f-bf4d-0c617e8b560a/vehicle_transfer_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e28ece9c-5ebd-49dc-8768-a4b69bc2e393/how_to_calculate_age_in_months_excel.pdfIn PDF document text
    • http://xizisimavi.pbworks.com/w/file/fetch/144543423/dipiro_pharmacotherapy_handbook_10th_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b494de5-cebc-4d18-a856-e394fe26c7ce/what_does_the_phrase_age_of_reason_mean.pdfIn PDF document text
    • http://masawumel.pbworks.com/w/file/fetch/144420687/math_logic_problems_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e02b78b-7c9c-462e-aaae-6efca3f8f1fd/87162044792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77f54807-8e67-4e05-86fc-8c5617dcb958/what_is_the_electromagnetic_field_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/307c3921-154a-4978-8946-6b29d42cd7e5/i_am_a_man_chicago_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0250ffa-35a0-46dd-89ad-004df6b86924/annabel_lee_edgar_allan_poe_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e0cb67b-5db0-4e02-bff1-02ad2286d1d2/viwefutawunifenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38870c40-3e8b-4b1d-9df2-3a92dffa4eb5/nojidifebiteripodusenaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9c6166-bfd0-427b-ad47-3475329f6694/83770478942.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 5372 bytes
SHA-256: c4fb5b301237cb999bce7d8dd8842b46be65a2d0fc5f159e5c77bae5989b85f4
font_01_sfnt_off0000ec2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 10820 bytes
SHA-256: b53b5cacfeea7907621b931a5afeaf6e0a7d492d7fe713f42755f7f627f0dd4a