Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a57c6fd468ea5dc…

MALICIOUS

PDF

68.8 KB Created: 2021-09-19 03:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb45fa8ec71565e96a9a32bd5cf0468e SHA-1: a19bbe8902545abe0c1aa0b9b7d3e89cd7bf0bcc SHA-256: 4a57c6fd468ea5dcba1cbeabfb2350dd92b5d3fa58d9aa8768193288098c6762
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are associated with link farm heuristics and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=photoshop+elements+2020+torrent
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/rovozizowuwe.pdf
    • http://lingeriedediva.com/UploadFile/file/2021091613174173499.pdf
    • https://laundrybyconrads.com/nbloom/fckuploads/file/66260926864.pdf
    • http://www.szphotar.com/admin/img/files/87969233112.pdf
    • http://klpa.net/userData/board/file/37153690865.pdf
    • http://dreamwith.gni.kr/ckupload/files/gotuzelogapagozowatawigod.pdf
    • http://szyoujin.com/UploadFile/file/20210901121403074.pdf
    • https://skillmapmagazine.com/ckfinder/userfiles/files/42928099629.pdf
    • https://okinawa4d.com/contents/files/vawazu.pdf
    • https://rmp-familienanzeigen.de/cms/files/dawakadevodenepo.pdf
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/62863973699.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614590870dc22---74300616654.pdf
    • http://swvocal.com/data/se2/file/46360547565.pdf
    • http://mtcnx.com/upload/fckimagesfile/pawivobu.pdf
    • http://henghuitong.com/jingkelun/userfiles/files/20210908025939.pdf
    • http://ppogrimall.com/upload/editor_image/file/jofimusa.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/umpouhqh6c8bqi484isevqs7ie/54659094917.pdf
    • https://digireg.com/upload/walupuperirud.pdf
    • http://delfosventures.net/userfiles/files/seniti.pdf
    • https://marljivo.hr/userfiles/file/xakorilo.pdf
    • https://copab.tn/216mag.svn/uploads/files/19089390425.pdf
    • http://yuanjiangchem.com/upload/files/peramaxopewigovulojafo.pdf
    • http://hoangduy.vn/vn/files/15264428212.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_off0000b217.bin
c4eb2bf6f36f5bcf928948fe23c8ce8d49efcc703f4dfa87784fb63db15712e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB217 14324 bytes
font_01_sfnt_off0000d5c2.bin
e373ff7649947e51389b23fde4ba1cd7ffad918c42009063b2d30aaca49faeb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C2 10504 bytes
font_02_sfnt_off0000ed7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 16792 bytes

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