Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67c61b1423e4cbb…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 11:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86a71bd0045c25abb60d3a163be7dd12 SHA-1: f479feadb1508437bab35c96334e9a6a126c6ab3 SHA-256: a67c61b1423e4cbb203462fd80b7c6ac6fe8a9fe3d0fc8f842f9a6aef3c54160
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates this behavior. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 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://nomylo.ru/uplcv?utm_term=bubble+shooter+tm PDF link annotation
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/pijogonizidagimovokikogu.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/vekesobunogiwuvoguri.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/dumitusemiji.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109120522105294.pdfIn PDF document text
    • http://espwireless.net/uploads/file/94466822527.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/68649282790.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/40990246269.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210917005418.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-7/20210907201331512131.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/84099812006.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0c2915d010fc9a8e9d7eed2c662de2af/39123401294.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/ripawerirakuda.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/62374325138.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210909091454.pdfIn PDF document text
    • http://irinabailey.com/upload/files/72451774261.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/xanelakizes.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210907_C11C1BFD4CD5AB77.pdfIn PDF document text
    • http://delve-cr.com/uploads/wabepatobaputogobuloje.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b97afd0daf---gasajevododu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc2026bf4---sonumukedazetafewujozumo.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/davota.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/67485096484.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/xukuxifixopalebijogon.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://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_off0000cf2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2C 10308 bytes
SHA-256: 53d0fdab471f2e0360c345e01c086e2917dcdcc7048b118049760719af26bee1
font_01_sfnt_off0000e67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 18456 bytes
SHA-256: 4ae6c4aa4d3470f5d585c5b4b82ffd893ec9cd9c8a7e0fbb48ca332d9b64c201

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