Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f3705399805d72…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 17:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 66535c37e8353a906903d2395bd4c8fb SHA-1: 410bca6980f8e21b27b95c8481b9e6826fbb8bb4 SHA-256: a7f3705399805d725f3f42e5bdf53b29bda3ef7b2e88187588b607a8dc05f10a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is the primary function. While no scripts were explicitly extracted, the ML classifier and the nature of the URLs indicate malicious intent, likely related to SEO manipulation or hosting further malicious content. The presence of a Google feedproxy URL with a 'how to get pokemon go hacked' query suggests a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 4

  • 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 http://kielcenoca.pl/files/file/41220559444.pdf In PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/59494856752.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/24383880526.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/34640552614.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/2193320189.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/vekamuravofoxikuwafov.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/79667972724.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/lakitevilafex.pdfIn PDF document text
    • http://e-hematologica.com/users/file/80327885503.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/30314281995.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/890882141.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d386de702---gokojetu.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210901170048_uljr4d.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/33344648635.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/23998178412.pdfIn PDF document text
    • https://mlspoland.co/files/file/60324775360.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/45523874236.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/gakevumopuwisabobedib.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/84635211188.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/33329306812.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d7c3nr2bqo9anboarraltje3u1/67219904229.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/lugabeneduvogilikem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+pokemon+go+hackedPDF link annotation
    • 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_off0000da8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 10724 bytes
SHA-256: ad4b392a73f73718bd0a67fc063948eee325cf96e10f3a1ce84c8354ec6b9c08
font_02_sfnt_off00010ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE7 17900 bytes
SHA-256: bef5e4a0a166bbd236512fdaf045f99b31282ed2c3355d1b8d8473ebd1b7d41e

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