Malicious PDF — malware analysis report

Static analysis result for SHA-256 967da3db9701bb4e…

MALICIOUS

PDF

105.5 KB Created: 2021-03-26 09:25:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4141cda72663731e0b98d6cf02735e39 SHA-1: 9f06acfc52456720188c25fc2ea11da4f0f508b1 SHA-256: 967da3db9701bb4e7e934595e753e201abea04ea27bc4118010034f0c9bdad80
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, suggesting an attempt to redirect users to malicious or spam content. The document body is heavily obfuscated and unreadable, but the presence of numerous external links points towards a link farm or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/award?keyword=calcium+and+phosphate+homeostasis+pdf
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/e753bb0.pdf
    • http://tulalenabeparuk.iblogger.org/acumen_dash_cam_manual.pdf
    • http://powajaxib.medianewsonline.com/xexosil.pdf
    • http://xidufefonudug.sportsontheweb.net/49439206316.pdf
    • https://tazipapanora.weebly.com/uploads/1/3/0/7/130776418/c3b77598de03881.pdf
    • https://momosedudufapi.weebly.com/uploads/1/3/4/6/134622660/wozoratopererom.pdf
    • https://cdn.sqhk.co/tijinujul/hamHgdX/zoberabitutuvurirepejesi.pdf
    • https://cdn.sqhk.co/reriwoduriju/fiaWhbE/soccer_stars_united_pegasus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a2f4fe96-f1cc-48e6-bf51-689dc9fee012/what_were_the_complaints_of_the_third_estate.pdf
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_2d517a183be84cd293d33939b5e999e5.pdf?index=true
    • http://likutolejit.onlinewebshop.net/61978813174.pdf
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_c2eebe45486b44cfa67e89bedbabca01.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2f01f92e-e51b-4480-a3e7-a04b9f59faa5/titan_440_epic_parts.pdf
    • http://veduredetud.epizy.com/54296317229.pdf
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_7107223fad71464b9c9f4f0201a861ac.pdf?index=true
    • http://giworutiw.myartsonline.com/kodiwup.pdf
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_57b56b1458ab487d95ac8669a00b04fb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/81b2771e-6c26-47df-9805-008a3561fb8b/xisamunosedirukerali.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_off00015c7b.bin
cd418cc72e2dc4e53b9512115b1aebfd658fbce65a73027e256c85818a50a0d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C7B 5204 bytes
font_01_sfnt_off00016e08.bin
2b3beff7c35104634d41cce8aebae65b9b040f354953e09b176adbe19878a9aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E08 12848 bytes

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