Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0bdbfe1648095ac…

MALICIOUS

PDF

90.9 KB Created: 2021-05-05 03:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c5a69624d0aa19342ee72d27436f9c58 SHA-1: ea87d1f1d1b86aa6d998c15a52e91ba05786ab83 SHA-256: b0bdbfe1648095ac39e7dc2b1480cd6cf331471751e6f7ce133315d2ea4768df
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=masterpiece+the+hound+of+the+baskervilles+2002+watch+online PDF link annotation
    • https://cdn.sqhk.co/nogorodizet/6vgdEid/big_winds_and_big_damage.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopijaku/iqcjet0/company_profile_format_word_document.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408711/normal_5fd6657bdd76b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477163/normal_603c74e109faf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393626/normal_5fd0a7cf91a37.pdfIn PDF document text
    • https://cdn.sqhk.co/xusopusavo/jh2gcij/josuzutovotamidusowoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/bejomewuv/jiBhdii/the_ordinary_serum_dark_spots_review.pdfIn PDF document text
    • https://cdn.sqhk.co/rudugebakivo/ghjbhcK/tamil_nursery_rhymes_songs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_60165857e5139.pdfIn PDF document text
    • https://cdn.sqhk.co/banuluwopote/qhfUf8d/inpixio_photo_studio_10_pro_windows.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415537/normal_606c5b02da85d.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxefoxo/4ACiib9/assistant_director_jobs_nashville_tn.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/jbWidgi/11163466405.pdfIn PDF document text
    • https://cdn.sqhk.co/bivadudit/hbY1iiu/javusevejevijituf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497646/normal_5fe099c9cb701.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
    • http://vagimosaperijoz.epizy.com/balanced_literacy_framework.pdfIn PDF document text
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_a552a6d85947439aaa77b946c974ca8d.pdf?index=trueIn PDF document text
    • https://58fabbca-0322-4868-a582-948aa19840f9.filesusr.com/ugd/93748c_6ea52e8eadf44d21b135902fadc42fa3.pdf?index=trueIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_f21b1a6b0ec544c7aba2bbea93877d0e.pdf?index=trueIn PDF document text
    • http://bufalirafuma.epizy.com/nj_food_stamps_income_guidelines_2018.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_off00011474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 5760 bytes
SHA-256: 4e0d57b4e3b7562bdac58ffac06b127fb8818d571d37dd7a34ee02739ec35457
font_01_sfnt_off00012815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12815 11736 bytes
SHA-256: 2c31d19f7bac1d59fd201c63c18a778611871d5c183118ddc783ddb630b200c9
font_02_sfnt_off00014fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378