Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac38f300c5ac444f…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 11:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f46e9b80703ddaaa1ffec165474d91b SHA-1: 857665c025be978fa562c7645aa2e60adbba5ac9 SHA-256: ac38f300c5ac444fb4e60f17943889d5dad91d29b03f951926106bfa8bc10226
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614b37183bead---xijegadi.pdf
    • http://hejia-ele.net/upload/rubigujufexigefesoredidu.pdf
    • http://bernardthevenet.fr/ckfinder/userfiles/files/popuveja.pdf
    • https://keralahappyjourney.com/ckfinder/userfiles/files/73181785551.pdf
    • http://gyndoktors.de/ckfinder/userfiles/files/33588526928.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/bafavivokifaboki.pdf
    • http://pasted-radio.de/web/files/35028177049.pdf
    • http://glassick.com/userfiles/file/loxonupumu.pdf
    • https://eric-parnes.com/ckfinder/userfiles/files/29112120026.pdf
    • https://lorus.rs/files/vuwux.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614142c87662c---nejufanu.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/56406635323.pdf
    • http://0851gay.org/userfiles/202109file/2021091318253070554.pdf
    • https://at1apigroup3.com/contents/files/96888572537.pdf
    • http://fujieshubao.com/zk/UploadFile/file/2021091219014473499.pdf
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/14868509169.pdf
    • http://szpk.hu/_user/file/98244338634.pdf
    • http://china-miyaco.com/img/file/202191314470.pdf
    • http://hp-cnc.de/uploads/files/rezowadeveweb.pdf
    • https://bacsionline.net/userfiles/file/23362816761.pdf
    • https://nguoixunghekiev.vn/userfiles/file/sutozixameruxivimenise.pdf
    • http://eurekaelearning.com/upload/news/file/watimaseva.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+transfer+my+music+to+my+new+phone
    • 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_off0000b001.bin
ea594975b83b10ed2aa688ed17043d19f8d238df9e09a8f1511ea517c28809fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB001 10988 bytes
font_01_sfnt_off0000c968.bin
ba26f1f68883c77c88a1f108b4fd0e8ea403cba094e64790ffc155dded14a26a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC968 16876 bytes
font_02_sfnt_off0000f431.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 16792 bytes

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