Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c04dc73cfbc671…

MALICIOUS

PDF

77.3 KB Created: 2021-03-19 20:26:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c3b4443a8671881f6aebcf1418552f1 SHA-1: 73834ffc6596aff592d2fdb148a5e13253e2e894 SHA-256: b7c04dc73cfbc671e16c705dd33b9759f677e08f19d9077954a78d8b2a8346a9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results or direct users to malicious sites. The primary malicious URL identified is vilenefex.ru, which is presented under the guise of free game downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=bejeweled+games+free++full+version
    • https://static.s123-cdn-static.com/uploads/4452372/normal_5ff31bc918db1.pdf
    • https://cdn-cms.f-static.net/uploads/4365546/normal_602ad9a889493.pdf
    • https://cdn-cms.f-static.net/uploads/4391317/normal_5fd98b113cd67.pdf
    • https://cdn-cms.f-static.net/uploads/4486965/normal_60225f976de56.pdf
    • https://cdn-cms.f-static.net/uploads/4476443/normal_600a65082e5e1.pdf
    • https://cdn-cms.f-static.net/uploads/4454984/normal_603615ad1ed8b.pdf
    • https://cdn-cms.f-static.net/uploads/4473375/normal_602b9629d9237.pdf
    • https://static.s123-cdn-static.com/uploads/4488815/normal_5fe433c9d5da9.pdf
    • http://gewarum.66ghz.com/vataxipuvevop.pdf
    • http://veritebadisifif.iblogger.org/celsius_to_fahrenheit_conversion_table.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_d6bedf5bc7f04a9caccb5c19701bd848.pdf?index=true
    • http://netomadutimafe.onlinewebshop.net/richard_rorty_achieving_our_country.pdf
    • https://uploads.strikinglycdn.com/files/9fb31d7c-84a6-4ba4-a65a-3ee22e307c9e/how_to_use_lean_mean_fat_reducing_grilling_machine.pdf
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_ee8e9a83fd1c49afb75b0fd6c6311eab.pdf?index=true
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_8058b865d1e24fbeb3c93b00c79414c9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/83ca694b-7209-4496-85b0-e677ea156c72/what_are_some_debate_topics_for_middle_school.pdf
    • https://uploads.strikinglycdn.com/files/387f5728-fc78-4984-bc42-e11294cc1095/sosavojed.pdf
    • http://fidikaxano.myartsonline.com/49012350107.pdf
    • http://givonomiruf.rf.gd/common_sense_book.pdf
    • http://zavukazena.epizy.com/world_politics_trend_and_transformation_17th_edition_free_download.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_off0000ec78.bin
902e8de5c6f4ef955311c11fdac8dd613c01a780f7f6617122923d1e024cbdc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 5504 bytes
font_01_sfnt_off0000ff3d.bin
43df1f18fc0b719b3cd1eb244e9fe5427d93aab428c117705054afd63069002f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 11356 bytes

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