Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b74a920218639a…

MALICIOUS

PDF

104.0 KB Created: 2021-01-15 22:27:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3c6152419733681db4791fc046b4febc SHA-1: 85e37513cea1b51c65525b7dad73e8b4af334340 SHA-256: 90b74a920218639adce92b366bd8ee62e0a656378ec1a2dec2900cba8cc2e6fd
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URLs indicates a phishing or content distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=inurl+index.php+id%253D1+china PDF link annotation
    • https://cdn.sqhk.co/kojetovukufo/heHjbjj/maxpreps_football_high_school.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/jighsRX/app_creators_pltw.pdfIn PDF document text
    • https://site-1180908.mozfiles.com/files/1180908/41631674291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_5f89843f312ce.pdfIn PDF document text
    • https://cdn.sqhk.co/jilebodetifa/haCKXhi/word_battle_multiplayer_games.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuzemabad/hf4lvhY/90789565844.pdfIn PDF document text
    • https://gorigopaf.weebly.com/uploads/1/3/4/3/134341526/1c6d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390381/normal_5ff0b4e86a8c1.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/icjim3O/66713110623.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/3ds_emulator_for_laptop_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/mazikuro.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/bososuxunila.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/charles_law_word_problems_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/52797558745.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000144be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BE 5116 bytes
SHA-256: 3a9cce32f5c7b4593fa65aef6b62974ee651c00d48f704092289a4467a9dc9aa
font_01_sfnt_off0001562e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1562E 11352 bytes
SHA-256: 09c65a8ca223496b813ab8741a5b4e45ee75f79d0d1a74af3e5b7b26efa6f6ee
font_02_sfnt_off00017d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D10 16332 bytes
SHA-256: e32afdfd90aa2a39e6b096f7609da19dfcaa92143c40b6e540002b0b9eadd856

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