Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7cf058deb88342…

MALICIOUS

PDF

75.4 KB Created: 2021-03-19 09:33:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d18690706b6686ddf3fc701d54ab9bcf SHA-1: 27f25d43434245e965d3ea429b518bda62115f77 SHA-256: 4e7cf058deb883428aed096337a3e3af57a42cc5cf4fa1b78d3d41236583662d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one primary malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

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://seumenha.ru/strik?utm_term=strict+rules+disney+stars+have+to+follow
    • http://lnstgramhelpcopyright.com/cant_stop_wont_stop_book_review9a9e7.pdf
    • https://lofativunami.weebly.com/uploads/1/3/4/5/134581692/fubusajemi.pdf
    • https://fademorojotuk.weebly.com/uploads/1/3/1/3/131379253/pepuxamolezewol.pdf
    • http://lnstagrambusiness.com/linear_equations_in_standard_form_worksheet_penguinqs9et.pdf
    • https://bulodogezuso.weebly.com/uploads/1/3/4/8/134868115/walininuba.pdf
    • http://mritzoliver.design/basic_tactics_for_listening_3rd_editiew8v.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/53464d05-b487-4fab-ae59-afdeabd78efb/safuvivovilulabirafazaka.pdf
    • https://uploads.strikinglycdn.com/files/6660aa3b-076a-44b6-b050-95a00558cd28/lemifaxabekaxabigidafe.pdf
    • https://uploads.strikinglycdn.com/files/60f6a3ea-cd1d-4474-a126-c1f87d6cdb01/rangers_apprentice_the_ruins_of_gorlan_reading_level.pdf
    • https://uploads.strikinglycdn.com/files/97fb2e56-e18e-4aa4-af2b-8568a95a5d97/how_to_reset_infrared_thermometer_ck-t1501.pdf
    • https://uploads.strikinglycdn.com/files/79355bfe-9043-4d59-8d5d-9f32609b4ade/geruvapamebinirawaw.pdf
    • https://uploads.strikinglycdn.com/files/0e63dbef-ab39-445d-bb2c-5c27957813d9/jurusujibige.pdf
    • https://s3.amazonaws.com/nosepevozux/fevovamediguwujugibid.pdf
    • https://s3.amazonaws.com/wanasuvedigo/kushala_daora_mhw_guide.pdf
    • http://nimunofat.epizy.com/93205317813.pdf
    • https://s3.amazonaws.com/jolituzoji/totarosimimejozixubazige.pdf
    • https://s3.amazonaws.com/bivanud/91166974536.pdf
    • http://nunitew.rf.gd/apsc_syllabus_2019.pdf
    • https://uploads.strikinglycdn.com/files/87bec99b-0c65-426b-9e45-f3a4db2a2764/jawamaniwizepewow.pdf
    • https://s3.amazonaws.com/fusopoxipo/complete_subject_and_predicate_worksheet_high_school.pdf
    • https://uploads.strikinglycdn.com/files/a45e0998-19c6-4657-ae1e-03792ecca02f/zasamiruded.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_off0000e745.bin
753663bd3c3cba1f5d3237f6c5e4cea7415d55c8b06b13301543096e7accabba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE745 5464 bytes
font_01_sfnt_off0000f9f0.bin
c4f4e456b650e768b8b2b4a0ddfd69914826f6cc6190dc89000e5938f423de4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 11188 bytes

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