Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa90efe5d29ab1e8…

MALICIOUS

PDF

64.6 KB Created: 2021-04-04 23:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 07be1627531a42273f5f4b09352858cd SHA-1: 7717595e15f64776944e8a1b7f936636a931980b SHA-256: aa90efe5d29ab1e8d413431609e434dcb91ac0133621dcd2afce04e2f969cd49
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains an embedded URL pointing to 'seumenha.ru' which is disguised with a 'gordon+ramsay+cooking+course+book' query parameter, suggesting a social engineering lure. The PDF also exhibits characteristics of a link farm on disposable hosting, further supporting a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=gordon+ramsay+cooking+course+book PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4448980/normal_5fc7c52c3ebd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369760/normal_5fef5647c23b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_60698c09be3e3.pdfIn PDF document text
    • http://xibiselid.medianewsonline.com/14816229546.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486365/normal_5fc90bbfa69cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463526/normal_5fcec0c552876.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/amplitude_shift_keying_theory.pdfIn PDF document text
    • http://josebixotarez.22web.org/vozanu.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/tutasujal/wilobamo.pdfIn PDF document text
    • http://najijojovigom.myartsonline.com/26339860296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fcf2cf-aa51-4413-b57a-9a97643b67d9/fodopobobodipejezinitiru.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/7129124290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d76794-88e9-4629-9b82-d7050992267f/what_is_the_plot_of_the_book_twilight.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/rakumizupimojek.pdfIn PDF document text
    • http://denuvila.rf.gd/warsaw_pact_ground_forces.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ed93f3c-1e95-47c7-9fd6-e862098d0207/88040884358.pdfIn PDF document text
    • http://suwedafi.epizy.com/west_side_story_full_movie.pdfIn PDF document text
    • http://joliwemakanufix.rf.gd/kekonalazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33301474-d4b0-473d-b31b-ca12cd9d5437/fotuxozu.pdfIn PDF document text
    • http://toxanezijar.rf.gd/vuvexiz.pdfIn PDF document text
    • http://piretiwojof.epizy.com/mika_grace_kelly_piano_sheet_music.pdfIn PDF document text
    • http://vajekalisafemun.rf.gd/ados-_2_manual_free.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_off0000c21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21D 5564 bytes
SHA-256: a0f29bb7eef386905983d65de0665a49bd2b3423c8f10d61990672e397b43000
font_01_sfnt_off0000d504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD504 9380 bytes
SHA-256: dec6271ea10a940739c932a0bf3ced447bf6bd7195c7b6848e0eafc55baf7beb

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