Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a363aa88ddeeb27…

MALICIOUS

PDF

67.3 KB Created: 2021-04-02 06:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3a13a9ad991c29186383d20f57bfe0f8 SHA-1: d49be6b544ee187fdac95c19efd3726475f34062 SHA-256: 4a363aa88ddeeb27d92a23f2f84767228d36e015546632c39113c8c0b0746f22
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains or disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://dugedepap.ru/123?utm_term=ascential+annual+report+2015 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407807/normal_5ff3a43dcfbce.pdfIn PDF document text
    • https://baxemazone.weebly.com/uploads/1/3/0/7/130739829/84e6c648e.pdfIn PDF document text
    • https://xudixakutax.weebly.com/uploads/1/3/0/7/130776611/tefigap-xokegi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452400/normal_604ddf2760a5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468828/normal_5ff6c74193106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489404/normal_6028e3cd281f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370768/normal_605451aaa66f9.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/wejuvono/spotify_free_android_tablet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ffb4d7-3c59-43c5-ab89-e30b59042dde/what_did_dr_gundry_discover.pdfIn PDF document text
    • http://vuzegemed.rf.gd/mustang_owners_club_gb_forum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4af27c4-612b-4407-9130-3e5670d877c8/fender_passport_venue_600w_portable_pa_system_review.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/podekosexivaxeb.pdfIn PDF document text
    • http://derajina.rf.gd/computer_science_an_overview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4c417cc-25e1-444d-b8e0-b2034a5ce76e/38209183215.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/bazujavune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22042ce6-25a2-47f6-9250-26c78ef18efe/r-51m_bookshelf_speakers_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec5a1b05-18a8-4342-ae08-ab8df5506d8b/28364281121.pdfIn PDF document text
    • http://kubivakov.epizy.com/angles_of_depression_and_elevation_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/xesipusevituzadasop.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/bjcp_score_sheet.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_off0000cbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD0 5368 bytes
SHA-256: 46207f2f4103e1b7c5a6559300432afe815a42edd0734b96c16be4256331f28c
font_01_sfnt_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 10288 bytes
SHA-256: e253e977a2522c9f00e3c668181b37b47ffc61d8799977f37c39ced6b760e4ed