Malicious PDF — malware analysis report

Static analysis result for SHA-256 67303970c5393317…

MALICIOUS

PDF

98.8 KB Created: 2021-06-07 17:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2cd018f4963c80a945e593a70c28a19a SHA-1: 1e143314cf92ae865f735a75c720faea5736416b SHA-256: 67303970c5393317b38fa89af8735e0e6c7d6d65f6e3877bac5e5341ac6dacf3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://jottigo.ru/123?utm_term=computer+a+to+z+full+form PDF link annotation
    • https://talibixakezadep.weebly.com/uploads/1/3/4/5/134590085/8052172.pdfIn PDF document text
    • https://finibolamojirum.weebly.com/uploads/1/3/5/3/135341575/14ddb7e9ac74a8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_605c8965c5e58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463306/normal_5fdb9f30d191c.pdfIn PDF document text
    • https://musegozaxugovu.weebly.com/uploads/1/3/0/8/130873783/e0e8e25d0.pdfIn PDF document text
    • https://sudewivozuv.weebly.com/uploads/1/3/2/3/132303071/26f8bd882105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_604cd520088fd.pdfIn PDF document text
    • https://mobonojijokatu.weebly.com/uploads/1/3/4/3/134320628/54603cf446e01ee.pdfIn PDF document text
    • https://fowedejuman.weebly.com/uploads/1/3/4/5/134518602/zogipup-fuvawovo-nebifuxitixopo.pdfIn PDF document text
    • https://pobebuzajo.weebly.com/uploads/1/3/4/6/134677480/ac7d34e9694.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/janubamakutadug_zuvoted.pdfIn PDF document text
    • https://vijamosikafej.weebly.com/uploads/1/3/4/7/134772382/bdea10532e.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/1423283.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/b65dc6d2-911d-4a32-a2c0-a697dfb52cf9/how_to_hack_in_prison_life_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05241b4e-e072-49f6-9260-e4bbcf035df5/23047723919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbb7f727-8db5-4c73-9fae-df8c9c5d801f/songs_that_bring_back_memories_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e2ba736-cd61-4e59-a527-5c544aac91ee/que_es_un_estado_de_derecho_y_sus_caracteristicas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d52ac6b5-9264-4b8a-bd6e-83670ba3f22d/46730040934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/961a6b24-ca8a-46f1-9d79-67f564d59f92/reading_comprehension_passages_with_questions_and_answers_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ec61e63-6317-45eb-bcfc-8a68dcc5026d/39786301856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/094b6c16-d653-4bb4-b60f-bfbc0d83a80c/buxekuvolixapugimaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ba15c33-a66d-48bf-8df6-c74dbe8671b3/winujurajeduj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6b23bf6-2e49-4693-85f4-9cff9ccd524f/fluke_175_price_in_india.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11246 4824 bytes
SHA-256: f902b9da6c2c1755ccce1aaf2fd0d2cf4cd6f8bc61909ecf2f5de274954598a9
font_01_sfnt_off0001229a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229A 10604 bytes
SHA-256: ad6e90f18d050924c85605d549f583a5d9b1c30b7dca094707c578bdcf554bd4
font_02_sfnt_off00014706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14706 16188 bytes
SHA-256: ac331ff209e496a545000daa6c22a418664ce8bb09dd9fd1314a38219ce2e6a2
font_03_sfnt_off00015c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C6F 9508 bytes
SHA-256: e6d9f385769dc4c01275c0c428bcfdd32d8f4308af0443659078689f68b2cf6a