Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c47e0da5b9c908f…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 18:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05769fed989a5c4d46345d632f74bc37 SHA-1: 3f6dbf9459eec5776098b9de5ac4953112f3c586 SHA-256: 2c47e0da5b9c908f0e2e4b9724d849283244926fe787be7444f68a309c749035
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. Multiple heuristics identified external URIs and a link farm structure, suggesting the PDF's primary purpose is to redirect users to potentially harmful websites. The embedded URLs and the PDF structure itself point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://catamma.ru/uplcv?utm_term=as+1100+standard
    • https://movingalpsfoundation.ch/userfiles/file/xinamopuworutoboda.pdf
    • https://apsco.ly/userfiles/files/26871447424.pdf
    • http://immobilieninvestors.de/userfiles/file/50440690877.pdf
    • http://whdhgs.com/uploads/file/20210923211550911.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161558b3df0322---liwudixowu.pdf
    • http://lamorenj.com/userfiles/file/70933571275.pdf
    • http://greenearthgardens.org/userfiles/favugakilor.pdf
    • http://udmvdpo.ru/images/files/kamesimemovovux.pdf
    • https://muahohangnhat.com/app/webroot/uploads/files/gemugonojufobo.pdf
    • https://nulifeus.com/~nulife/userfiles/file/maxipa.pdf
    • http://terezmisszio.eu/files/file/letene.pdf
    • http://salamatekhanevadeh.ir/ckeditor/files/files/jorixidagogisepurezolu.pdf
    • https://promaxsuspension.com/csmimage/file/madaledetozijagu.pdf
    • http://novosib-sport.ru/ckfinder/userfiles/files/jaxujetafebu.pdf
    • https://karthikaspices.com/uploads/file/53136786354.pdf
    • http://myxroad.net/upload/userfiles/file///59028603431.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161351424cfcab---tazuwuves.pdf
    • https://usgcambodia.com/userfiles/file/30716109220.pdf
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/65499076401.pdf
    • https://nusantarabet4d2.com/contents/files/41688659266.pdf
    • http://caramelitos.sk/files/lonizitaraxe.pdf
    • http://vektorma.ru/uploads/assets/file/51902773933.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_off0000b245.bin
adfbff4da4f9ab93348873d5947be168add4ceadf1b6ee662c0263779d1c8518		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB245 16780 bytes
font_01_sfnt_off0000dce1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE1 16792 bytes
font_02_sfnt_off0000f4f8.bin
1337dbbee691c0a00b7441504d5cfbdc8663f31528b12b1cced9e4260970ee54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 10004 bytes

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