Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c85e3b6dc0956b…

MALICIOUS

PDF

106.8 KB Created: 2021-09-23 16:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c916ad40eb50e8ca9b655b8e86acb6aa SHA-1: b273d63ba99de08cc1548e13e5f1dc452236200e SHA-256: d1c85e3b6dc0956b48b06bbd59f15aa1bc6984072610a52cb0974469c0111d68
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm hosted on disposable domains, likely to obscure malicious links. The embedded URL points to a suspicious domain, which is likely used to host a phishing page or distribute further malware. No scripts were extracted from this sample, but the PDF structure itself is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://allytemp.ru/uplcv?utm_term=saddleback+basic+english+grammar+book+2+answers PDF link annotation
    • http://ncfc.com.tr/ckfinder/userfiles/files/14366400250.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/16717065444.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/19050121492.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d36608ae4---11397799206.pdfIn PDF document text
    • https://tmtteks.com/files/4617945945.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/82734615855.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/14287223150.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://salwangurugram.com/files/razixu.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/nidolekom.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7941a8e0ce3325fcfd7314c5120674e3/winajejibifimuwerevesaved.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/lajenilanatob.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/92305452729.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/97765531944.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613de1564076c---77248670088.pdfIn PDF document text
    • https://deepex.hu/hirek/files/31247904496.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/sijotuze.pdfIn PDF document text
    • http://hijoin.hu/editor_up/12482220472.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/perejerekonikubezosezur.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/nadasosoxapixuren.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/40247723232.pdfIn PDF document text
    • http://okun.su/upload/file/620055546.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/gudaxosezadudotukodageji.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_off00013844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13844 11232 bytes
SHA-256: 1baeb8a50876b969e2420dc45f3d18a6e989eaf06e2b31204bd3a03a5c9cee5e
font_01_sfnt_off00015231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A43 19260 bytes
SHA-256: 44cd4155c39c9a68321a120a59d6c1a3a48fbe4f53a740ca56ac5bf3aadaaef6

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