Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae80cbe59a1754bf…

MALICIOUS

PDF

81.7 KB Created: 2021-04-21 05:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b7c27de6b2e35b5e547c058cc0a545ae SHA-1: 78df7cd965c38bfbd962e05de95e33be0595c6e7 SHA-256: ae80cbe59a1754bf39cebc4fdf425f082d7e78b184882f37f4fe2b81fb9ec789
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, one of which is `https://fokemale.ru/strik?utm_term=the+myth+of+sisyphus+absurdism`. The presence of embedded URLs and the link farm nature strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=the+myth+of+sisyphus+absurdism PDF link annotation
    • https://duwifugikez.weebly.com/uploads/1/3/5/3/135351140/8615119.pdfIn PDF document text
    • http://spacexfoundation.net/jugekoxukipakufn1ujc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387932/normal_60520345450ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383921/normal_6054e1245ba85.pdfIn PDF document text
    • http://timurberg.ru/90334813928jwqqb.pdfIn PDF document text
    • http://xojokare.iblogger.org/77292225669.pdfIn PDF document text
    • https://cdn.sqhk.co/pikevasoze/geog0G0/50360397008.pdfIn PDF document text
    • https://cdn.sqhk.co/zupololano/QhflEhp/3539627842.pdfIn PDF document text
    • https://cdn.sqhk.co/beledufe/djbjbgi/jevoxoxukanuv.pdfIn PDF document text
    • http://sazefakopek.iblogger.org/32887718649.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408582/normal_5ff3c3c7bedaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407070/normal_6047c1ee7d562.pdfIn PDF document text
    • https://cdn.sqhk.co/semiwewedazi/6ggpjgQ/25067889055.pdfIn PDF document text
    • http://dreamingdeveloper.com/tefal_oleoclean_deep_fryer_with_oil_filtration__storagev4wz6.pdfIn PDF document text
    • https://rofasaxoropop.weebly.com/uploads/1/3/5/3/135316675/46a2bad1ada.pdfIn PDF document text
    • https://kusipujetaz.weebly.com/uploads/1/3/4/4/134462876/nazoritavideg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zedilegol/maytag_maxima_washer_will_not_turn_on.pdfIn PDF document text
    • http://gozozofufeb.rf.gd/25078593837.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/electro_technology_n3_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/19808299697.pdfIn PDF document text
    • http://nafipeni.epizy.com/ielts_reading_samples_with_answers.pdfIn PDF document text
    • http://dusefepov.epizy.com/does_walmart_have_gluten_free_food.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_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 5440 bytes
SHA-256: cf8b10ef594922c1d76fbdfd7b96d57482c5388526b3e055137b5208118974fe
font_01_sfnt_off000114ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BA 10808 bytes
SHA-256: f3abb45ed2905b9b74d2a58acba835e9c84290418b9c952c884bc92ee429d2c9

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