Malicious PDF — malware analysis report

Static analysis result for SHA-256 b793bcb4d4d7bdc3…

MALICIOUS

PDF

86.9 KB Created: 2021-05-12 12:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b752c5b22dc069b77a3161f84140c7d9 SHA-1: 23152ebee40dfbd759450063e379df55c8f591cf SHA-256: b793bcb4d4d7bdc39733e149d6581a915b2c445f46f138a1df763db0d0f87439
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO manipulation tactic. One of the primary external links, 'https://jumiwimov.ru/strik?utm_term=what+does+visual+cues', is suspicious and likely leads to a malicious site. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=what+does+visual+cues PDF link annotation
    • https://cdn.sqhk.co/nutanujel/gdhgjhf/fitbit_versa_2_special_edition_vs_versa_3.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwilaj/ihZUc3V/world_war_1_and_2_years.pdfIn PDF document text
    • https://cdn.sqhk.co/tagodepa/gijgWJk/38027950002.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/haauxhd/ritixupu.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/iwgjgeJ/batman_joker_comics.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/aiinEXZ/music_plus_mp3_player_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dizukenepu/QhfQc3i/gumavosam.pdfIn PDF document text
    • https://cdn.sqhk.co/rifebonapesi/jdjdhhB/42636611284.pdfIn PDF document text
    • https://cdn.sqhk.co/pibilebomek/jdjbsjg/zuvevabanewejojo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d64d5b41-a66a-4b78-b87f-0feaf8e9cf76.filesusr.com/ugd/cf1aed_bb0c8b27e9b14631897cb4f941e9f562.pdf?index=trueIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_7d9626b7299a440cb0c4d49702743ab9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/14216964412.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/29732328097.pdfIn PDF document text
    • https://7a6021ad-ea99-40b3-bafb-6570e045b460.filesusr.com/ugd/527ec5_04334d4a56ed4adea6bf91c6c1617227.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_ff40be80dd8c4a9bac96f0688b6fb854.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xokebore/46757908952.pdfIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_a1f96248e99641d7a4cf7d82e77b7b70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/self_confident_meaning_in_english.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_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 5004 bytes
SHA-256: 266185bd36ff0eb681a237994d3be3bf5de471985ebb81aacaaaa6db910c3d78
font_01_sfnt_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000112aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AA 10548 bytes
SHA-256: 7c01015aebcfd5569f8af6fa7abf5a81321604fead9a35b2386446886d4d3af9
font_03_sfnt_off00013709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13709 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b

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