Malicious PDF — malware analysis report

Static analysis result for SHA-256 6edf027436d92c2d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 10:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 426b429734cda15611ca8c8122aa9358 SHA-1: e3dbe9ec3f9bbdf60d104a21c92c4c0b07b79b90 SHA-256: 6edf027436d92c2d897c909761812b6d5d36e573c05dc6b07b9af9f59a741f26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs point towards an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=how+to+fullscreen+undertale+on+pc
    • https://bwawarszawa.pl/upload/file/93695513272.pdf
    • http://dichvutheapec.com/upload/FCK/file/65106782225.pdf
    • http://casaatlantida.com/userfiles/file///nabonixidex.pdf
    • https://shian-jin.com/UserFiles/files/pusaxetexalironiganufav.pdf
    • http://pk.mo/userfiles/file/88245302232.pdf
    • http://1day2night.com/UserFiles/file/90680842796.pdf
    • https://idealist.ro/userfiles/file/94127859962.pdf
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/68556302227.pdf
    • http://artkulinaria.pl/sites/default/files/file/16703427305.pdf
    • https://angkaganjil.com/contents/files/zonoluxixa.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff6fdf04ba---kewajejefaxako.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0f8884610---vuzoganalufabizoxabetoja.pdf
    • http://phongthuyphatloc.com/luutru/files/91669449030.pdf
    • http://youil.org/userData/board/file/25431354460.pdf
    • http://sasolution.kr/userfiles/file/94185173878.pdf
    • http://heldermusic.nl/ckfinder/userfiles/files/zusinasojosamuled.pdf
    • http://ge-mak.com/files/xaderonavodufogukasalu.pdf
    • http://smcertificationservices.com/userfiles/files/53897991617.pdf
    • https://needlugs.com/userfiles/files/1071543024.pdf
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/47491883536.pdf
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/lizisexagobudavegiwonize.pdf
    • https://dialogueinpraxis.net/files/docs/95643410403.pdf
    • https://istanajp.net/contents/files/47638999486.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_off0000dcfc.bin
f5b81701cbab198dcfa01cd396b71a82d39017d4c022e67355a5a606dc2d9dd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFC 10696 bytes
font_01_sfnt_off0000f5bb.bin
1dc2106cf75480676554b5fc762fa0b198b49a978f60c6f6554607053e33766f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 18600 bytes
font_02_sfnt_off000125d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125D0 16792 bytes

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