Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d78b15d7fe5c953…

MALICIOUS

PDF

69.1 KB Created: 2021-05-03 10:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 65b55404724fd2b65f3d5e866d173363 SHA-1: b4234104276ef38e307f1755205d4c5b42d9e156 SHA-256: 8d78b15d7fe5c953c2f575e88494ae2dc9e9f8e442fc10ada527c6e839c15abf
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://pelibifir.ru/strik?utm_term=is+python+best+for+beginners PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384144/normal_6022e021f3d10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473651/normal_606d0e6a66d0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382770/normal_60612cfcbfc24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473919/normal_5feb052e7ff44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388814/normal_5ffa864a82cee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501231/normal_6018106c2a247.pdfIn PDF document text
    • http://vipobora.iblogger.org/personality_adjectives_list_english_spanish.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478393/normal_5fdc524a08512.pdfIn PDF document text
    • http://nutesane.iblogger.org/94503316644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_606a151187b2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483083/normal_5fc750a2daa93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503874/normal_5fcbc20c62af0.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/c4ea5b10-36f2-46fa-8fe2-cca07c950e13/64259765558.pdfIn PDF document text
    • http://fumibomi.epizy.com/pegumu.pdfIn PDF document text
    • http://zemodofu.epizy.com/35937749118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cbbc4bc-e55a-423e-9289-3961e5af1ab5/american_flag_origins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c775e4c7-443c-4c29-be47-e8a2e3079016/mimavofisaged.pdfIn PDF document text
    • http://kaxogesidod.epizy.com/88164349245.pdfIn PDF document text
    • http://firosuvidafodi.rf.gd/57943257984.pdfIn PDF document text
    • http://kujojeg.rf.gd/tanatologia_forense_fenomenos_cadavericos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db7c5148-1e34-412d-b21f-1da1bdef63c6/15425171911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/212c61a6-0e50-4a3d-aa15-e62c6af9c0f2/bissell_power_steamer_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33d62801-9e0d-49a0-81c5-dfc8949d7b73/xidaridakowefav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66709632-600f-4da5-9579-e49ed81d021c/java_swing_tutorial_geeksforgeeks.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_off0000d36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 5100 bytes
SHA-256: ab3f5a0945be2baacf54a48b453806747506c6d0ac28504c2f25fe0006ac85ef
font_01_sfnt_off0000e4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 10048 bytes
SHA-256: d3660e066b93672afa50dd95a5631e7e6fa10db3abc41497b0842f8b75ce87d6

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