Malicious PDF — malware analysis report

Static analysis result for SHA-256 e473376aace528b3…

MALICIOUS

PDF

82.3 KB Created: 2021-04-08 09:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5494d7859d5d82d4aece59261b431389 SHA-1: 74f9c6c6d3906dbc2581a4692e4c88302b76750e SHA-256: e473376aace528b356db6645a0562389175e1de31f3abb59d56b7aaef2c1d18d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a large number of external links, including one to 'golowaki.ru', suggests a link farm or redirection scheme designed to phish users or distribute further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/123?utm_term=flash+a+d+converter+pdf
    • https://levivododusot.weebly.com/uploads/1/3/4/3/134307397/1813278.pdf
    • http://nezebesupojava.22web.org/goat_simulator_manual_points_easy.pdf
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/70c25a1de58.pdf
    • https://welaxulisura.weebly.com/uploads/1/3/4/0/134042468/7e13909.pdf
    • https://cdn-cms.f-static.net/uploads/4471464/normal_60399f588be12.pdf
    • https://cdn-cms.f-static.net/uploads/4380411/normal_606665477d2c4.pdf
    • https://static.s123-cdn-static.com/uploads/4453105/normal_5ff28542e02d7.pdf
    • https://benodamefeju.weebly.com/uploads/1/3/5/3/135346815/5859053.pdf
    • https://cdn-cms.f-static.net/uploads/4380523/normal_6063d8f418437.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/91a4818a-3b0b-42b1-aed4-5a476e413ea8/bright_starts_automatic_bouncer_assembly.pdf
    • https://s3.amazonaws.com/xamapebonijos/vujisipusidigukevaza.pdf
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_d085b729a6d34308a6c29750118d3239.pdf?index=true
    • https://s3.amazonaws.com/zibenoroduzuw/10480651386.pdf
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_d53b400976ea451593e7758bd68f6751.pdf?index=true
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_962c79d1f886423992fc45e9d6296da4.pdf?index=true
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_7d45b601f5de4bc4b232e806eb32d57f.pdf?index=true
    • http://besatewu.epizy.com/maths_logical_reasoning_questions_for_class_8.pdf
    • https://uploads.strikinglycdn.com/files/6b471fd0-3ac3-4a73-ad0a-7d1c634e49fd/funuser.pdf
    • https://s3.amazonaws.com/voropa/29213277942.pdf
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_46ab31416a5a4c65b761de547cbbf8aa.pdf?index=true
    • https://s3.amazonaws.com/voxipanovigepiv/72130024529.pdf
    • https://uploads.strikinglycdn.com/files/33bc47ff-bb74-4af7-afd3-21f95f4b28c9/physics_ia_ideas_waves.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_off0001041f.bin
84ee92fb1e6cf8b1da19e11489e01ea4612c975c612b2c04ff883604a6b55a96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 5260 bytes
font_01_sfnt_off00011603.bin
4f136a8e8f71058210da28bbe5adf6b76a79b84e4c86ac1ce099cf45417de074		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 10984 bytes

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