Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cd34d471f3b2ab…

MALICIOUS

PDF

119.4 KB Created: 2021-04-24 05:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d202af6ab2a1b59bcde35e43481ceb8 SHA-1: dc9287c76a563d078142e58c262f029af321b04f SHA-256: 73cd34d471f3b2abb1fa3d946603420f3270feb135094b7e4fb9569f03ca2a49
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with the primary heuristic identifying it as a link farm. One of the extracted URLs, https://botokaw.ru/strik?utm_term=functional+analysis+reverse+engineering, is directly associated with the malicious verdict. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

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://botokaw.ru/strik?utm_term=functional+analysis+reverse+engineering
    • http://futegejetebe.22web.org/what_are_fixed_variable_and_periodic_expenses.pdf
    • https://cdn.sqhk.co/zezegawutogu/zgjUXAi/rotator_cuff_tear_test_cluster.pdf
    • https://cdn.sqhk.co/tononapiwaso/gE9jfhc/87453614171.pdf
    • https://cdn.sqhk.co/melipetoluf/gj5gjaX/2d_shooter_sprites_free.pdf
    • http://saxosoxajivovud.medianewsonline.com/furujebalopakubiborir.pdf
    • https://cdn.sqhk.co/zadorari/jdHOOgc/change_color_of_image_in_powerpoint.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_6a49b5ae0b5448f698aa3e84ce00ee08.pdf?index=true
    • https://a8a57b57-a5e9-4b5c-b824-02731ce3a1bd.filesusr.com/ugd/cfa667_aac3e4cf261d4ae6af5cac49ef888cc6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7f406646-3eb5-4915-81f1-2dc684068484/coach_quakerbridge_mall.pdf
    • http://mijovutotukedes.onlinewebshop.net/what_are_the_seven_rivers_in_africa.pdf
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_8e2938dbcbfe435e823c034942e3246f.pdf?index=true
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_f83d9a7bd4d54fe8b3a40f50ab46e3a9.pdf?index=true
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_62ce8b21a947495e8a6429621b9fa54d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3e767380-d246-47c2-ba1a-a4d840d9e792/what_does_e4_mean_on_the_power_pressure_cooker_xl.pdf
    • https://013c3ecd-17dd-4738-ad87-554153c764a5.filesusr.com/ugd/36f25b_871744479c2d48d59e83aacd07da4ab1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7ca11add-5586-4997-ad06-9f467bd0897d/xopat.pdf
    • https://uploads.strikinglycdn.com/files/8915d8ea-5f81-4764-b182-fefba5d80468/mipafexi.pdf
    • http://ruwapebubori.epizy.com/ieee_abstract_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000187e0.bin
b7b260ddf4d191b6a327e24a8ce6e5bade73ba5b9f71a273ff02e8128d3bb49a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x187E0 2900 bytes
font_01_sfnt_off0001923c.bin
a613df047427a8ff76fc0fd5baf4f246842c8de88e1ad8d91aac777f34200355		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1923C 5084 bytes
font_02_sfnt_off0001a3b0.bin
5dccf8bcaf7bf674a64d1094c28e6201624bb25ce3fbd51cf74acb2f46465ec4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3B0 13460 bytes

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