Malicious PDF — malware analysis report

Static analysis result for SHA-256 728b3d49b2f51620…

MALICIOUS

PDF

78.7 KB Created: 2021-05-23 16:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 180f4b1aac2e179f28104888270f9395 SHA-1: 22c44dd657e797b18bc6c7deec65a2eebc79642c SHA-256: 728b3d49b2f516205a8dd5879580d31a600eb5f08e0f7c6d33871ff2a8a6843e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings. One prominent URL, 'https://jacksth.ru/strik?utm_term=pubg+mobile+lite+zombie+mode+download+for+android', suggests a lure related to downloading a game. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to 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://jacksth.ru/strik?utm_term=pubg+mobile+lite+zombie+mode+download+for+android
    • https://pebawozo.weebly.com/uploads/1/3/4/8/134865175/14f1819b5d.pdf
    • https://girawosanisab.weebly.com/uploads/1/3/0/7/130740609/7827393.pdf
    • https://kadogejajufa.weebly.com/uploads/1/3/4/7/134717900/0e0df3c.pdf
    • https://vepemetamat.weebly.com/uploads/1/3/4/3/134354227/c6939b7c8b3.pdf
    • https://jejaxome.weebly.com/uploads/1/3/4/4/134443668/xojufaw.pdf
    • https://filikegepux.weebly.com/uploads/1/3/5/3/135346592/666781.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jalasilunaz/ap_english_language_and_composition_practice_exam_answer_key_2020.pdf
    • https://s3.amazonaws.com/kawotexulozax/japan_travel_guide_blog_philippines.pdf
    • https://uploads.strikinglycdn.com/files/ee05da1c-8ec1-4df9-b23f-02c6eb7d6467/what_is_the_meaning_of_aggregate_planning.pdf
    • https://uploads.strikinglycdn.com/files/69b95ede-582e-41ae-b3d7-059bb0693505/48930342579.pdf
    • https://uploads.strikinglycdn.com/files/a46fc7a8-24f7-46a1-8a7b-850c22bbc908/divine_mercy_image_original.pdf
    • https://uploads.strikinglycdn.com/files/66495ba7-67c1-4c17-a724-c78a228986fb/line_6_pod_x3_pro_driver.pdf
    • https://uploads.strikinglycdn.com/files/a8be8f74-3711-4f1d-a487-81d4875c1a97/ridirubixixipev.pdf
    • https://uploads.strikinglycdn.com/files/c0cf00d2-b606-4ca5-a12b-4f123f1f371e/femapula.pdf
    • https://uploads.strikinglycdn.com/files/afea2df6-3af0-4f6b-a276-a2fce45928ac/78387969368.pdf
    • https://uploads.strikinglycdn.com/files/11be1605-fb44-41f3-920a-2428eeee453a/12699693104.pdf
    • https://uploads.strikinglycdn.com/files/25e17b01-1e23-428d-801b-7e5a1ae05027/d__d_foods_inc_omaha_ne.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_off0000ec5a.bin
c6ce1fd88572d3d9b9e92d1753efe9392b6991df7dda23591877b1832b4887b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 5332 bytes
font_01_sfnt_off0000fe83.bin
7d0b19f51aebd4c13991fe7137d4a5d17e95c0ad54b722db3fa477623f9ffd33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE83 20732 bytes

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