Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb617c576efca6a8…

MALICIOUS

PDF

67.9 KB Created: 2021-10-04 04:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8da86fa79475aa7535d88b9ccdc858d5 SHA-1: 39f84300777768423ac99e2ed9e0876897922e00 SHA-256: cb617c576efca6a8b9c72534edf1aa63801a72c7aa653f5365444e8b44032001
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-only content, and embedded clickable actions. Heuristics indicate it functions as a link farm on disposable hosting, directing users to various PDF files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 67 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://kermoulin.com/userfiles/file/kapezada.pdf In PDF document text
    • http://lagostena.it/userfiles/files/40841494119.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/27889283470.pdfIn PDF document text
    • https://susta.vn/userfiles/file/92975261310.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/juludasurugodenoxemumur.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/jogetikakosop.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/6776302702.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/16719803139.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/37968520458.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/ruwirumixoxifepapir.pdfIn PDF document text
    • http://bodamvientin.com/uploads/userfiles/file/65726954059.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/tiromoxagoxalusemugalefeb.pdfIn PDF document text
    • https://balmbeach.hometeamcorp.com/images/usr/26958908031.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/23648349527.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/88316919769.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/24889403417.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/72288222430.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/lulobi.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/1ff99d16f6a9598b946af9204a8ce26f/62488105359.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/dokabududugodo.pdfIn PDF document text
    • http://demkapi.com/resimler/files/joparuxomoniruzewalipeze.pdfIn PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20210918_C3431896E570B4C1.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/72107232124.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/dl3drlducq95845v3o3aqimssp/64162493755.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/bosimabodatifazotujev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=use+android+phone+as+amiiboPDF 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_off0000af79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF79 10660 bytes
SHA-256: f3880305c2e03f76d5fe3c479d520eed715a60ceafc27c3cfe2cc720f12b36a4
font_01_sfnt_off0000c75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75C 13952 bytes
SHA-256: b5ed4dd09d93cc0e3ee5908bef597efd6e10f02f7121b36513ec687e3fdddf4b
font_02_sfnt_off0000ea2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1