Malicious PDF — malware analysis report

Static analysis result for SHA-256 234340e66df17514…

MALICIOUS

PDF

67.6 KB Created: 2021-09-29 02:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e905d79f3cf876cdbaa7577f766ffab0 SHA-1: 78885db98d06dc2e570e4c178e11226c96047640 SHA-256: 234340e66df1751499c974b988fb930850856a24dfd415cf22548d4deeba8b1b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a clickable action, designed to trick users into visiting external URLs. The presence of numerous links to potentially disposable hosting further supports a malicious intent, likely to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://ulleungroadtour.com/FileData/ckfinder/files/20210927_EF312C79C748CC66.pdf In PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/rifijuzudawimoreg.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/vilinejemerumiligovexe.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed88c51ce8---nosidebazofibeletawu.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/lolofaxopediripofelete.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/35778398411.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/81030657315.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/13849716545.pdfIn PDF document text
    • https://cartolmania.it/file/kosolelu.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/wefiwojuwofokexi.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/zemulawixijulelo.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/88387630799.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/6193342716.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/4f17d3eabafcb3bc46daa157b6dcaa44/72995604284.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/44373290976.pdfIn PDF document text
    • https://biocoils.com/img/file/nojegolaxosibavadiz.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/15463027131.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/33765000471.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/3226047238.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109060937052032.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/2917107375.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613504823cd4d---60377722130.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/dagatusuxapawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tamil+padam+full+moviePDF 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_off0000ae42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC654 14244 bytes
SHA-256: 6b48e4819f0be0307508e2964b33a59aaa89732853c39a06d49f626c1424ab98
font_02_sfnt_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 10320 bytes
SHA-256: be4a3b25b3f7e4e92e475d164a3fe95c523ef2db79cd39c6a63c663ea32845ca