Malicious PDF — malware analysis report

Static analysis result for SHA-256 5add4cc140777f62…

MALICIOUS

PDF

72.5 KB Created: 2021-09-09 17:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d06e57ea2320bbef5fe814068b44d41f SHA-1: 03171c097396fa8e82e4ac5d8643dbc5bac1cfcf SHA-256: 5add4cc140777f623d570fe35afb819550645e4925b647938065382b47cec785
134 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. The PDF contains numerous external links, many of which are hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a phishing or trojan download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=koplayer+download+windows+7 PDF link annotation
    • http://allycatering.com/userfiles/95559942197.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/23121400691.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/mivajarokexorirugikogo.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/34100498864.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/11976773060.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/65615332795.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/72300136799.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/dolajegotu.pdfIn PDF document text
    • http://medica-brno.com/files/55539172309.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/43271335844.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/36405157139.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/wezewasepososimarelozegof.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/sitozujapufizikow.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/15236179182.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130738a67618---39417691685.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/tofufekigemetidazuzodifu.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/revibatewikovuwof.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///83058129141.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/pifobotud.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/pibes.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4d1c838f8690f85ffe461fa3c36eaafd/47662053578.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/rugobuzoronoxujakid.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/32813789486.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_off0000ba8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A4 10528 bytes
SHA-256: a3c1bc8507d6d367c1e2c575a72c50260457f289942f2de2103853a316926f68
font_02_sfnt_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 16212 bytes
SHA-256: 9e137fc116b300d40d1e5f0b4b260b5768f315dc4283a5d1791dd73d9c3b7e97