Malicious PDF — malware analysis report

Static analysis result for SHA-256 a632d71c99ff39a0…

MALICIOUS

PDF

71.3 KB Created: 2021-10-01 07:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9c04ed3cb56e5c59d98185a473451bda SHA-1: 9a1418531e5ededcff6955b1f2b35418b8a97a38 SHA-256: a632d71c99ff39a0adfaa6ff485635afcce37a5455f08388453853e59527c97c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://pamatudarbai.lt/ckfinder/userfiles/files/29915404581.pdf In PDF document text
    • http://web5gstore.com/Files/files/14782085326.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/jugakavapidogoz.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210928_64E6851DC803C47A.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/997137146.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/vukapiju.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/71554964893.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/mizukajavonorikazivu.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/72741852761.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/98532820382.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/lelexugimipog.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161403374192a6---36935807162.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/nerufigojaned.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/24171906.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/kuzazapugexudipumijat.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/paxovososefufima.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/85251408738.pdfIn PDF document text
    • https://huanghecables.com/d/files/74731460029.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/kamenapujamud.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/fizojamuwike.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/85234350648.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/36635456603.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/nivumabelofoxiborajujakaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=offline+strike+apkPDF 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_off0000b244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA56 18132 bytes
SHA-256: 194d9e6bd6daf911ff34b5a8081c4167c317b18c6c61be154801a818f41f5e11
font_02_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 10348 bytes
SHA-256: 8e16fd5fc720a034971e03a4c1a94287b106fc3ecacdafcd7536ab4c802106af

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