Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28675add5921590…

MALICIOUS

PDF

378.1 KB Created: 2022-05-17 19:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: dce336d42c48b7afb34ec635e07ceb40 SHA-1: 8f20b09edd7eedaf031f9d8e7c9d2f4fd55ecfe7 SHA-256: c28675add59215907f602f1decacae6ed107dc485ef2e04ce40f41b885e29a43
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. Heuristics indicate it contains external URIs and a callback phishing lure, suggesting it's designed to trick users into contacting a malicious entity. The primary malicious URL identified is https://fecuq.co.za/XSRYdR1H, which is likely part of the phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8491

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns
  • 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://fecuq.co.za/XSRYdR1H?utm_term=operating+system+concepts+10th+edition+pdf+download+full+crack
    • https://julogunakununu.weebly.com/uploads/1/3/2/8/132814048/pibup.pdf
    • http://tauthuy.vn/upload/files/jonebeseninonisazopanoteb.pdf
    • https://rafaela-motores.com/userfiles/file/72100396532.pdf
    • https://punufepezakuba.weebly.com/uploads/1/3/2/7/132740965/dafemos.pdf
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/2191915.pdf
    • http://damutech.kz/upload/2022/03files/220327185453528903ub60x.pdf
    • https://mamesegerefoko.weebly.com/uploads/1/3/4/6/134658020/4278086.pdf
    • https://nujamoxe.weebly.com/uploads/1/3/4/2/134234607/8923276.pdf
    • https://niburisugop.weebly.com/uploads/1/3/6/0/136082965/lapotowug.pdf
    • https://vinacoma3.vn/userfiles/file/2575354015.pdf
    • https://tesafugefiwa.weebly.com/uploads/1/3/5/3/135318727/8eb752d57fb0.pdf
    • https://wobapuzufisuro.weebly.com/uploads/1/3/4/0/134042344/2293016.pdf
    • https://pemimitajeli.weebly.com/uploads/1/3/0/7/130739011/lerimimegotodox.pdf
    • https://gopogaxewose.weebly.com/uploads/1/3/4/0/134013169/e15853a315c1f.pdf
    • https://xukotonaxi.weebly.com/uploads/1/3/1/4/131453431/kofot_dotav_jajaziweg.pdf
    • https://komamezumef.weebly.com/uploads/1/3/1/3/131398541/e3688936f0.pdf
    • https://tebifenan.weebly.com/uploads/1/3/4/6/134675993/53bf9371b6251a.pdf
    • https://xujuwoxevosu.weebly.com/uploads/1/3/4/8/134896670/35330.pdf
    • https://rutobomidawizo.weebly.com/uploads/1/4/1/5/141512652/b7ff79a9e673b.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_off00057244.bin
a5d20938629fe28f978f59cfeecb319d3dfe909a9124d41bb4691f5fb3a3cae0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57244 18428 bytes
font_01_sfnt_off0005a34c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A34C 16792 bytes
font_02_sfnt_off0005bb63.bin
aaef88ec8d93a43e9fbd6533a465d0034bc1f9c3f80446fb6ec5a427b8c0dd0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB63 11656 bytes

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