Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc461e621b4f0cb…

MALICIOUS

PDF

76.2 KB Created: 2021-03-19 06:24:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89347f6837060950d3b0ee8b713ae3dd SHA-1: 231d03c110ea971aafcd86595189fe2774dbf2d9 SHA-256: 9bc461e621b4f0cb6596ff3b4f97f04b08e95bc7113cc51fa691d2bf9ef2445a
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a malicious phishing document and hosts a large number of external links, many of which are likely part of a link farm. The primary URL, 'https://pelibifir.ru/wix?keyword=continuity+calculus+worksheet', is suspicious and likely leads to a malicious site. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect the user to a compromised or malicious resource, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/wix?keyword=continuity+calculus+worksheet
    • http://zifufarox.getenjoyment.net/rotuzazutaguteseboli.pdf
    • http://fanilobepewe.sportsontheweb.net/tracheostomy_types.pdf
    • http://tukomibewi.getenjoyment.net/gezadibinisekinerebas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vabemavuputenif/48267068891.pdf
    • https://s3.amazonaws.com/xojafemori/49044727927.pdf
    • https://s3.amazonaws.com/wujodibu/cellular_internet_of_things_book.pdf
    • https://uploads.strikinglycdn.com/files/06a226f6-2e3c-43c1-8837-232efc17f3be/how_many_calories_in_a_pollo_loco_fit_bowl.pdf
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_c9e555a279b74a5b92b785bdf7b60828.pdf?index=true
    • http://leparitupoxow.onlinewebshop.net/2704343381.pdf
    • https://uploads.strikinglycdn.com/files/b749e336-a1f6-442a-ab5d-a0f3c44bfaea/adobe_premiere_pro_2.0_system_requirements.pdf
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_e7fc3df8c0cf40cea148223885c62a98.pdf?index=true
    • http://bifiwapaz.onlinewebshop.net/31095833756.pdf
    • https://s3.amazonaws.com/siwixomudit/what_do_the_warning_lights_on_my_dash_mean.pdf
    • https://uploads.strikinglycdn.com/files/9259c30f-e436-443d-a8ab-94b35b1d3b4c/83211602455.pdf
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_7f9c0b2d771f45d18aaa26668b3d9f8b.pdf?index=true
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_c7af95bf68ec4bf6b3082d292e19752d.pdf?index=true
    • https://s3.amazonaws.com/mefovu/wallpaper_point_blank_android.pdf
    • https://s3.amazonaws.com/wuniku/32771803149.pdf
    • https://uploads.strikinglycdn.com/files/a0a0b5d3-a4ad-44e4-bba9-2d2e5edca3bc/29429474901.pdf
    • https://uploads.strikinglycdn.com/files/cd3d6838-7e9c-4cac-b1df-4fb903a7ef8d/45585397815.pdf
    • https://s3.amazonaws.com/pusixa/27787140741.pdf
    • https://s3.amazonaws.com/julexekubaj/16628985664.pdf
    • https://s3.amazonaws.com/jebokizez/when_we_were_young_flute_sheet_music.pdf
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_8b343baa23b94fd5b3536e4ca614336c.pdf?index=true
    • 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_off0000eecc.bin
64fe72aa606c1c0b39ccbb11cde81f6b63177853d3d7abc8b1a130e260e9aed7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 5052 bytes
font_01_sfnt_off00010009.bin
e6e46b1faa2a7f64d959fcb4252ce4bc75e4806db4df8fb8eb425f2e54e2544a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10009 10308 bytes

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