Malicious PDF — malware analysis report

Static analysis result for SHA-256 1329965bbf6607c9…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 03:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f704e923ef208e7c4c66ffcf19d9504 SHA-1: 1fd839a0d139262cd67f9f8107db3c2f5a3aba06 SHA-256: 1329965bbf6607c9ccc60eb6f86ca924d69ae6ffd48e564d2b317873fd888d4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers strongly flagged this PDF as malicious. The presence of embedded URLs and the overall structure suggest it is used to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=mapy+android+bez+internetu PDF link annotation
    • http://www.asap-recruitment.net/upload/file/23783609804.pdfIn PDF document text
    • https://equimat-cheval.fr/file/93986967049.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/zenezisofijal.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/45807369125.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109031913573089.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/61520519790.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/n70rv6sgg00or821h7oui97i55/26017295917.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/giwito.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/luwamobomasut.pdfIn PDF document text
    • https://brakos.it/file/tojer.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161427148c133f---4218457237.pdfIn PDF document text
    • https://alpinashop.bg/files/zifasoranonijirubego.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/72903242377.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/59350826155.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b22094e074---62412327163.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/98890909515.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/vomabelinubapulesak.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/jonevevij.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/gopozinijitivabifirefam.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/40675838119.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/positele.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210907_081745.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/bagazesotunixiduzazu.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/28927052635.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_off0000d0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AD 19136 bytes
SHA-256: 87f80e1d03ab81c87ba56e78ef68bf51fb31c17a9c316d3a034fa4d5a2bbd090
font_01_sfnt_off000102f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0F 10580 bytes
SHA-256: 906140792aefc42043d4e1c590269d95e19bb64a9125c578a4970612548d800b

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