Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7423e813d57e6b…

MALICIOUS

PDF

66.6 KB Created: 2020-12-16 04:00:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 36762e683156477a7ef454917239b190 SHA-1: 8c800c66aab83db7e806447853097cc6fe81933d SHA-256: 0c7423e813d57e6b8820aea049c833c360055119d2d77185ae4a72e74b9ef913
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external PDF links, with one prominent example being 'https://supekekimut.weebly.com/uploads/1/3/4/8/134871395/digidebezis.pdf'. The presence of embedded URLs and the ML classifier flagging it as malicious further support its suspicious nature. Although no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to distribute or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffset.ru/aws?utm_term=solving+systems+of+inequalities+worksheet+algebra+1 PDF link annotation
    • https://supekekimut.weebly.com/uploads/1/3/4/8/134871395/digidebezis.pdfIn PDF document text
    • https://likixulojuxe.weebly.com/uploads/1/3/4/3/134386003/8049598.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e5f17ddb-5896-46da-8d68-7328b6e04752/autopage_remote_start_xt_33.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd97ec3c-e386-4060-9949-39e4008e7c76/19744734552.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9cb9441-1cb0-4abe-b020-ba7000727ec6/cyberpunk_2020_the_roleplaying_game_of_the_dark_future_2nd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f390d4b2-e1d4-43d9-962c-9ed831a69c0b/97185417838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a45ce587-6d2d-4e02-83bb-63440dd29a82/21251084785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94ec3009-9325-4cbe-a8f8-00d70086bd4e/gositenizesazera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb24dc2b-3076-4596-9840-51c8abe06a82/guide_words_practice_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e39150-5c7e-46c2-b5d7-2698752cd317/64264786505.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc589c6405d5340f34924f2/t/5fc748595fecd2174b5c5e3c/1606895706544/zonesadotokimuradol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edf1b1b8-0b45-4bc6-afa8-3ac878a43304/sozaxusibuvamipalofujew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1a541ad-ba38-44b1-b7c5-c55574a85f4f/xuvib.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b2ee81da8a590db23872/t/5fc922d111c7f938249c3899/1607017176233/hustle_castle_friends_without_facebook.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA23 5804 bytes
SHA-256: 34b79cbd85329a4cfdfd7465a72701c8f527b344eca7d86810d71c3b84ebc896
font_01_sfnt_off0000cdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCE 9832 bytes
SHA-256: f6b12a87fca82108f5390ce9551663d323ad84f9fc59c6c679355a8c1296839d
font_02_sfnt_off0000ef70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF70 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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