Malicious PDF — malware analysis report

Static analysis result for SHA-256 da299406ba2c636a…

MALICIOUS

PDF

72.2 KB Created: 2021-03-13 16:22:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 570b347f2b9a556ecdc4122f1c9e9877 SHA-1: 52f7f7b1c900a172d3cd55b09e35116ff16a6653 SHA-256: da299406ba2c636ae32ca9618dceaf1420ef3e81c5cbd71b9a37dd36a4ad8089
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=today+weather+report+in+paschim+medinipur PDF link annotation
    • https://cdn.sqhk.co/luxixumogez/5hcbHUL/lasozibinazekaminaniwu.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/jjiiyhe/14014003538.pdfIn PDF document text
    • https://cdn.sqhk.co/vavapezami/IsibigG/87847441801.pdfIn PDF document text
    • https://cdn.sqhk.co/ximirujusuxo/iyihcE7/word_blocks_connect_stacks_word_search_crush_games.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/YBxYhdK/xabeladazifunap.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/fL4Qiet/43833111281.pdfIn PDF document text
    • https://cdn.sqhk.co/dojagomudek/hagg5ie/dremel_1680_scroll_saw_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/6hjbhfW/50615949494.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gevejonitu.onlinewebshop.net/special_education_in_contemporary_society_7th_edition.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/willhi_wh1436a_temperature_controller_manual.pdfIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_0523a6dcb969449684c578ba0885d30f.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_2177c40f2d9c47b68d999125ccaccf66.pdf?index=trueIn PDF document text
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_156d09f9d5a447a09d882372cc4a7c2c.pdf?index=trueIn PDF document text
    • https://2c829bd7-5347-44a5-bcae-da9087253ebb.filesusr.com/ugd/b56239_d7928870a7fe47b8bfd77d21cae1c8f4.pdf?index=trueIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_b4f5ca68542c4072a1debc7d69f2a9b3.pdf?index=trueIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_8bac3228746a4a6f8d3b85526e25bda0.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 5424 bytes
SHA-256: 4fe94fe9820f5d37669d541d404d370524c7a3980744f2d7c3058dfae9b5ebdb
font_01_sfnt_off0000ee72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE72 10960 bytes
SHA-256: ed8b642ce6696fe2fad437130ca6d1434fbbe0363e0309d95ce89f889f90d0a4

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