Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ef061913c9ccbd…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 20:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8b3ad35fd7813f942e45700d83dcb06 SHA-1: 446dbc035f4f00bab5a6a37a0183d8f5da6728cf SHA-256: f9ef061913c9ccbda32c227c953b43309daf70a4ea6208c35cd4aa699d8e70b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=best+photo+restore+app+for+android
    • https://cornwallstaffagency.com/userfiles/file/89833100588.pdf
    • https://sinarwaja.com/account/files/vifojeniwopamukuguzitafer.pdf
    • https://innovativallatgyogyszer.hu/fileok/file/lemolezoxebe.pdf
    • https://egca.fr/userfiles/file/58070405874.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/8923907324.pdf
    • http://haki.vn/uploads/files/23884556126.pdf
    • http://schubert-hh.de/image/file/46757027833.pdf
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/gamazesinage.pdf
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/46655436326.pdf
    • http://wittlich-luexem.de/userfiles/file/lovila.pdf
    • http://hzzxtl.com/UploadFile/file/20210904162538405.pdf
    • http://ohmytour.kr/FileData/ckfinder/files/20210908_5F6A89C30C291C99.pdf
    • http://turchifiltri.com/userfiles/files/32082757366.pdf
    • https://rotterdampools.com/contents/files/kanusilij.pdf
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/10286367977.pdf
    • http://euro520.net/userfiles/file/1631790806666185339.pdf
    • http://theheavent.com/userfiles/files/gudaduxekena.pdf
    • http://daglichtfilters.nl/ckfinder/userfiles/files/merilefavuxavudoxowiwa.pdf
    • http://marmaraisg.com/images_upload/files/68472571919.pdf
    • http://sendedianqi.com/upload_fck/file/2021-9-6/20210906012745566742.pdf
    • https://bushregenerators.com/userfiles/files/ropuxifexurunogal.pdf
    • http://tpdw.pl/userfiles/file/ronanifas.pdf
    • http://inannamsao.com/uploads/files/jenezamatabiwix.pdf
    • http://shoreluxurylimos.com/userfiles/files/fadegibudatatem.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_off0000de13.bin
7e31524f0a993d85d501f9f4016a42cacb10529c9dd7de48d6e9f488a4329dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 17376 bytes
font_01_sfnt_off00010b05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 16792 bytes
font_02_sfnt_off0001231c.bin
9f3b9e5f20a424a3ee405ee0ef57e41c812adca96d9e1a32f406caa37c71f125		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1231C 10600 bytes

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