Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5988307873d9fe…

MALICIOUS

PDF

81.7 KB Created: 2021-05-09 02:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5207a1bd32a6b32d1b4b7fee0f8d25b2 SHA-1: d85f5e60a97c8e7ad6ef9dad7fa2cc20d55841e3 SHA-256: 7d5988307873d9fe77cd87bf80094687964e549fb24e6ab78f2b1c507a17a370
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and one primary malicious URL. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery via the embedded URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=my+whirlpool+refrigerator+is+not+getting+cold+but+freezer+works PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4528959/normal_6040fc576d572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372980/normal_6048052f80d07.pdfIn PDF document text
    • https://vanopatabef.weebly.com/uploads/1/3/1/4/131407067/b79eec.pdfIn PDF document text
    • https://bidiguregila.weebly.com/uploads/1/3/4/7/134700143/1137069.pdfIn PDF document text
    • https://sefelitajirowa.weebly.com/uploads/1/3/0/9/130969992/df2e26df23cb.pdfIn PDF document text
    • https://nelizebowi.weebly.com/uploads/1/3/4/7/134734992/8883471.pdfIn PDF document text
    • http://shoop-ff.ru/luzaluzijaxasbwwhm.pdfIn PDF document text
    • http://usesalon.xyz/grounded_theory_research_sampleqtnew.pdfIn PDF document text
    • https://siviwoxepigomuz.weebly.com/uploads/1/3/0/7/130739754/lewiz_xebadojobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489057/normal_606d0e3ce8140.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426280/normal_5ff684f67f51f.pdfIn PDF document text
    • https://gabesusot.weebly.com/uploads/1/3/4/8/134895193/lifamaru_xunabubi_xudasepomos_segapenizik.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://uploads.strikinglycdn.com/files/95108c61-cabc-4e55-8dd1-7099e3aaf436/what_is_contract_negotiation_in_agile_manifesto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f038bc06-da5a-407e-93a0-986abf242871/ragotebom.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/94404810319.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/39955987037.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/mightier_than_the_sword_achievement_outer_worlds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90c889bd-f931-4626-9f63-715d5e609f04/kodek.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/anniversary_cards_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa927ab-a349-47d9-872d-9f238045f8a6/82492896799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf9ca849-68f5-4e07-9598-5a8eeebd8429/what_does_crips_stand_for.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 5752 bytes
SHA-256: 5af78119fb26544e1c785bec7a8a6782ac2dce8d46dedc1de52e4f6af5bc639d
font_01_sfnt_off00010575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 10676 bytes
SHA-256: 5b0f7ce873181e78a83f404f235368026f0083cb96f26b1dd1d47f80b64b414f
font_02_sfnt_off00012a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A02 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176