Malicious PDF — malware analysis report

Static analysis result for SHA-256 517f86ab236f946a…

MALICIOUS

PDF

91.2 KB Created: 2021-05-21 13:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a2ae46a2a69f2f7e6d5e3a87c8c57e9 SHA-1: df071035a4ab7032aa65dd34d829abcbd7a31860 SHA-256: 517f86ab236f946a6a574caaf98e68947cc3e86a1b38d91558355329b2a6c6f2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign-looking documents, but one suspicious URL (ponafet.ru) is present and flagged as external. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware delivery. Although no scripts were extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=nuclear+decay+chemistry+worksheet+answers
    • https://tepukijamuboze.weebly.com/uploads/1/3/5/3/135301813/zomamiferike.pdf
    • https://zetewewab.weebly.com/uploads/1/3/4/4/134479884/01bc0e67.pdf
    • https://vosasavowaje.weebly.com/uploads/1/3/4/5/134587316/20795c4542cfbe4.pdf
    • https://zuxibonidape.weebly.com/uploads/1/3/4/8/134889984/25cab983abe87.pdf
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/jojetixe.pdf
    • https://suguturame.weebly.com/uploads/1/3/1/4/131438741/2917f8c.pdf
    • https://pigulanofalo.weebly.com/uploads/1/3/1/4/131406379/nidob.pdf
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/jozudituforisazit.pdf
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/kekugepodigi.pdf
    • https://bowonalixatan.weebly.com/uploads/1/3/5/3/135347428/8f7702669a.pdf
    • https://cdn-cms.f-static.net/uploads/4371536/normal_6033e75bbf914.pdf
    • https://cdn-cms.f-static.net/uploads/4381752/normal_601d6eca2f75d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wurivuve/core_mathematics_questions_and_answers.pdf
    • https://s3.amazonaws.com/pulavokaxe/hootsuite_free_mac.pdf
    • https://uploads.strikinglycdn.com/files/8baaa0a9-4746-494a-ba91-92cea9d9a642/56091170595.pdf
    • https://uploads.strikinglycdn.com/files/81c4a455-950a-46e3-b4ac-2416819ff8bb/gordon_ramsay_cookbooks.pdf
    • https://s3.amazonaws.com/zisulamisozoto/why_was_the_great_depression_important_to_american_history.pdf
    • https://s3.amazonaws.com/rurosaveruk/what_are_the_different_types_of_organisational_cultures.pdf
    • https://uploads.strikinglycdn.com/files/8333cba3-b564-421a-836a-243017ded947/65258593321.pdf
    • https://s3.amazonaws.com/natewared/13035783963.pdf
    • https://uploads.strikinglycdn.com/files/c96e434c-f0a0-4bce-9bbe-52b29ec7a486/what_salary_do_you_need_to_live_in_san_francisco.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124af.bin
1b66ba15efd5894c35ac5e551e505f6fad43ee782c3e4229b6bb000b2ce74f0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124AF 5404 bytes
font_01_sfnt_off00013703.bin
2b4e7deaa59c468d145723b6145ac1ba626498af3617c137ab00c644b9b06fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13703 11988 bytes

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