Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64c9af83884aba6…

MALICIOUS

PDF

68.5 KB Created: 2021-03-24 09:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d79a7b5e57c49ccd200d3ad462632d16 SHA-1: c636df51af1a2fc66378bc548257eb42816e0897 SHA-256: a64c9af83884aba63207552a4f23b96adb62a6cfcdbd309bc849d42fec9ce768
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical detection for a link farm and a high ML score. It contains numerous external URIs, suggesting an attempt to redirect users to potentially malicious websites or engage in SEO manipulation. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristics indicate a likely phishing or malicious redirection attack.

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://leonvi.ru/123?utm_term=angry+birds+transformers+turbo+energon+telepods PDF link annotation
    • https://cdn.sqhk.co/nesorosuxim/iehjice/zupena.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/b3Gf9wq/perfect_kicks._me_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458824/normal_6037ef7a8cfbb.pdfIn PDF document text
    • http://jubogori.iblogger.org/kegolaxezajov.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/njaPweS/naruto_senki_mod_anime_avenger_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/miwizawi/XRzJGYc/switch_controller_pro_connect.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_601321f378485.pdfIn PDF document text
    • http://nafesotarun.22web.org/the_blind_side_book_genre.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/xNNjdHE/32848446416.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vonikolodu.rf.gd/free_powerpoint_award_template.pdfIn PDF document text
    • http://tenurusimuxu.epizy.com/90186803126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/713e8a4c-932a-4fdf-8c16-2f3b69d2c3d9/19319248227.pdfIn PDF document text
    • https://692937ca-140d-46b9-9715-018e108c1018.filesusr.com/ugd/2540a5_1798444fa5d644f98e28595cdca1f400.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac889abd-9009-4d70-b625-333822ae8df1/xojepuminileribomiwu.pdfIn PDF document text
    • https://53ee2ee6-42da-4c96-954f-60f726bc8d53.filesusr.com/ugd/de2744_a161119ec486432b81176f8001ef0e8d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3689582-b7c6-438d-a53e-dd0500c235b3/3_major_types_of_subsurface_mining.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7239da14-14f4-4788-970c-99e94aa2ff9a/95202699269.pdfIn PDF document text
    • http://pozadel.epizy.com/short_story_english_with_moral_lesson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b519b6a-d166-4dfa-a892-c9d0f7b73e5d/kizofaregujutakabemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/958a703a-08a2-46a8-84fb-1117f1863c43/data_science_handbook.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_off0000ccd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD0 5592 bytes
SHA-256: e55b942dd1a2682f79f2c684d50f3b6b7c958d9866092b7cae2043b65847ca3c
font_01_sfnt_off0000dfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 10872 bytes
SHA-256: 29ac2246f3f5175aff48e0ea6d7cddc10b8f3edf3c7beace4b57327d59eb7959