Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae812512ea4780ff…

MALICIOUS

PDF

72.9 KB Created: 2021-09-22 12:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06f2a5395955b96c5c7a7e15448482e3 SHA-1: 3b47bfe29b6d4beb363c9d6884ced2edbc7b3794 SHA-256: ae812512ea4780ffddf29abab7d0726af6d3d2a425396e5fb2feab1fb52bb8c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://inwebjor.ru/uplcv?utm_term=what+to+do+if+you+forgot+your+pattern
    • http://chukguwang.com/files/fckeditor/file/regudekojenagumadagazu.pdf
    • http://psn-monolit.ru/img_file/files/vitiwibigolid.pdf
    • http://hanauhrova.cz/files/nadugisazudiwinitun.pdf
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/97974024033.pdf
    • https://makenie.com/upload/files/gutitogipogutixowixatezu.pdf
    • https://agriplan-rs.com/dados/ckfinder/files/15752450149.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/kowabibiragiwepizazega.pdf
    • http://decaldankinh.net/upload/files/bigalulokem.pdf
    • http://ranfeng.com/userfiles/file/2021-9///2021919916216014.pdf
    • https://mantyobras.com/userfiles/file/29528825109.pdf
    • http://movitecnic.com/ressource/site-image/files/jizupezofenuwovefive.pdf
    • http://asbufestival.com/uploads/FCK_files/file/ruvukisolejo.pdf
    • http://yuanhebiotech.com/upload/files/6920501365.pdf
    • http://beijingteye.com/upload/files/49898132629.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/kuhj3tptn4kvuvu19qnd58mos4/zosigokudi.pdf
    • http://ladyvenus.it/userfiles/files/10342176929.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/sutakekejojut.pdf
    • https://smg.bid/ckfinder_userfiles/files/94620376846.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1f4acb42d---jokavararedipekoden.pdf
    • http://centreforeffectivecoaching.com/media/file/verilo.pdf
    • http://acsalma.hu/userfiles/files/46979858290.pdf
    • http://myflora888.com/ck_files/files/98954004031.pdf
    • http://animationcoach.com/userfiles/file/43101485734.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_off0000ba37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA37 16792 bytes
font_01_sfnt_off0000d24e.bin
48b4fbb05641c56b027755be4973d133fae0bbabcf257dc04144a0a4d3aa1ddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD24E 10768 bytes
font_02_sfnt_off0000eadc.bin
45ad13a09e7bd8188e49b64636dab4bb6e8171ad3d2d2fda0c2525835c9e5ecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 16868 bytes

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