Malicious PDF — malware analysis report

Static analysis result for SHA-256 239ce9a93b52de56…

MALICIOUS

PDF

68.3 KB Created: 2021-09-29 06:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5a249e4c6bc2fa6d9ff93493a281c58 SHA-1: dd48a2e53f1e7baab80659531fc17fe571245393 SHA-256: 239ce9a93b52de568d18752494e5ec5c011c3f2249ad24ababd8123d7cf9bef9
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-heavy content, and embedded clickable links. The heuristic 'PDF_IMAGE_LURE' indicates a typical phishing setup where a screenshot is used to hide an action trigger. The numerous external URLs suggest a link farm designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=ultimate+knockout+race+unblocked+76
    • http://bhttourist.com/upload/fckimagesfile/kudamufurogixopavajakuzeg.pdf
    • https://araprinter.com/ckfinder/userfiles/files/21533426803.pdf
    • https://www.babetravelling.com/ckfinder/userfiles2/files/gajalitejujelo.pdf
    • http://zehanbiopharma.com/upload/files/butepimidezoxatafebota.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef4311c2e---fanef.pdf
    • http://kwong-cheong.com/userfiles/74704839202.pdf
    • https://kotata-zlin.cz/obr/clanky/file/73819342529.pdf
    • http://www.ih-consultant.com/ckfinder/userfiles/files/goxajilodavesodapawiwemed.pdf
    • https://xn--q3cceuw0c6ab0d2ii.com/upload_file/files/kopudukolij.pdf
    • https://langumeistras.lt/i/File/56631113050.pdf
    • http://aapltd.net/userfiles/file/jajasulabogajowawinow.pdf
    • http://britishcytology.org.uk/ckfinder/userfiles/files/logajavo.pdf
    • http://swatimishra.in/uploaded_files/userfiles/files/75434924406.pdf
    • http://w-f-l.de/user_img/file/94052012954.pdf
    • https://parlagame.net/calisma2/files/uploads/85615126209.pdf
    • https://cottonweb.net/userfiles/file/maderodibatakute.pdf
    • http://licausi.it/userfiles/files/rezikojodorutu.pdf
    • http://dinhviht.com/images/newtech/files/bepasinaxiz.pdf
    • https://motodubai.com/uploaded_images/files/sugasomaniki.pdf
    • http://charontrade.hu/data/file/24902862358.pdf
    • http://vuatoyen.com/uploads/userfiles/file/32323297679.pdf
    • http://kbautotech.com/board/datafiles/imagefile/sapuvigeziberotixivi.pdf
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/lexunemed.pdf
    • http://smirna.pl/files/file/22711663734.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad28.bin
09c9c5f7b0cbcaaec439453381e079ca0b8382314234c5a8502e4a7506c1ef12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD28 14188 bytes
font_01_sfnt_off0000d081.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD081 16792 bytes
font_02_sfnt_off0000e898.bin
d2f537b531dec9ce69cc22ce709e499f5e8510af634f3fe0608bc4a80113c80b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE898 10920 bytes

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