Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67f009f95c0fd92…

MALICIOUS

PDF

94.2 KB Created: 2021-04-16 18:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e8d281b4e714ac157c1bdc3166502c60 SHA-1: 237e1c46e0789a8d7620de1dab36d65948459226 SHA-256: e67f009f95c0fd92ac4da38bfc383c130d25e2c4920f476586aa3c2f1f7ca2fa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the presence of a link farm on disposable hosting, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=intro+to+psychology+textbook PDF link annotation
    • http://nerroba.info/netflix_para_android_marshmallowsqbru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482402/normal_5fcd33c8f3b1d.pdfIn PDF document text
    • https://lexawuvake.weebly.com/uploads/1/3/4/6/134610488/vafisefuvud-wiruv-tiwoz-seniweveteve.pdfIn PDF document text
    • http://aycotoro7.xyz/jafobebijolux2gjas.pdfIn PDF document text
    • https://jovovanin.weebly.com/uploads/1/3/1/8/131871717/fewewukidumi_sikizurasan_nawoxanusulu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426953/normal_5fc68e4cc5c3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468255/normal_5ff12fa8b2f00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456686/normal_603fb739e1096.pdfIn PDF document text
    • http://zatoboyvibor.fun/nosozezu8yb3.pdfIn PDF document text
    • https://mafugefowodofo.weebly.com/uploads/1/3/1/3/131378796/lurim_jexivaz_finawixipukol.pdfIn PDF document text
    • http://tk-time.site/elchronicle_new_characters8m2vd.pdfIn PDF document text
    • https://rasetevipumi.weebly.com/uploads/1/3/4/7/134714044/zoxol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_74b83e27ed0545d8976d1cfae846dcda.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/what_are_the_bodys_nonspecific_defenses_against_invading_pathogens.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/3563465655.pdfIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_0c22a177ec814f3ea2800e1ae8de91d7.pdf?index=trueIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_a62f6b820e8e42c7aad0d34a7a00a18e.pdf?index=trueIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_cd8b0f53c4194b9b8840777084ec24b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/92743085156.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/bhaijaan_cinema_video.pdfIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_49eb80dd271544c9b5a24eb7bee0b6d0.pdf?index=trueIn 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_off00013317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13317 5296 bytes
SHA-256: 0456da45bb2fb3db7b0a518843712fe3a8ad87e2c06d3da3013a3672cf7a1303
font_01_sfnt_off00014522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14522 11260 bytes
SHA-256: 0e0f3a591c3668405461f91e5db438d59d2bcf8a153448277169ea5e893548c4

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