Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc13f30f0e2cb24b…

MALICIOUS

PDF

68.2 KB Created: 2021-09-25 15:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b0706805d0be13e2ba6f29d763d51a6f SHA-1: 6ee5239c0f703283d4a3f1f1d85f277cfef7fb5d SHA-256: fc13f30f0e2cb24b9d3e5673993dc85ed8bb287e5890d2ce13d4729823fc78fa
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF is identified as an image-only lure, typical for phishing campaigns, directing users to multiple external URLs. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and numerous external links suggest it's part of a link farm designed to lead users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://themalc.org/files/file/20184211665.pdf In PDF document text
    • https://bdlvn.com/steel/upload/files/juzukilenuzewu.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/buzetazoka.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/kijubedupepad.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/nituxabudidifumasa.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/29864093960.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b95288122---wirogejademapojujuzodi.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/kotawidalulunakudowemi.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/diwoverupajexisenoxodul.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/dipakipa.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/divudotemomuderuwojukune.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qpetcavu6tcqlje0k41aru9rdt/83235602938.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/pagif.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/72961462969.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/dosolizukirigevubes.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/zitubeda.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/18808780001.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/92834856847.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/bozakuzekomolesokivigo.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219117609298.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/81024400435.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/72659997319.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/gakijolizutabababapiwuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=patiala+house+full+movie+watch+onlinePDF 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_off0000ad37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD37 14320 bytes
SHA-256: 6413e05d3e4401c8ad68f54c3b11c6b40d33cdb29cf074e2f5c90012a7ccbcc1
font_01_sfnt_off0000d0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D9 10756 bytes
SHA-256: 1cb6585769ba85b7bfea9b6e8725b047282ef341c2ab55c4a97b5de61f88711f