Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea11cc4ecc6442b9…

MALICIOUS

PDF

77.2 KB Created: 2021-04-06 11:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03e2764b6a74bbacdc47782f4ae85c49 SHA-1: 43c10341fb9fb2be6a361ff814f73be88b841b87 SHA-256: ea11cc4ecc6442b9463139e732c491fdca946fc38546815d46641c86f6783617
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ML classifiers and ClamAV, exhibiting characteristics of a callback phishing or tech-support scam. It contains a large number of external links, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, indicates it is presented as a survey report, likely to deceive the user into interacting with the embedded malicious links or calling a provided phone number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://vilenefex.ru/123?utm_term=sample+patient+satisfaction+survey+report
    • http://namsinc.info/tipos_de_sistemas_de_informacion_gerencial_ejemplosm71hx.pdf
    • https://lijoliwaxodoxi.weebly.com/uploads/1/3/1/3/131398144/wopoji.pdf
    • https://pelabomorifij.weebly.com/uploads/1/3/4/6/134628360/1551604.pdf
    • http://complerbnp.com/sodejetap0437q.pdf
    • https://cdn.sqhk.co/gixotagokezu/cN6JUU7/switchme_multiple_accounts_apk_download.pdf
    • https://jexavozomuju.weebly.com/uploads/1/3/5/3/135334786/jefutaxijalo_wopejiwexogi.pdf
    • https://cdn.sqhk.co/ruzemesafe/wDicphf/71002099401.pdf
    • https://jinuvavuvebox.weebly.com/uploads/1/3/4/6/134612635/c4d361.pdf
    • https://vafuzetok.weebly.com/uploads/1/3/2/7/132740798/6652509.pdf
    • https://zamigemunizi.weebly.com/uploads/1/3/4/3/134347724/6976430.pdf
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/320500.pdf
    • http://subfamjtii.site/mulokakucohgb.pdf
    • http://expressvpn.store/zebowuguwawozcys8p.pdf
    • https://beveroseve.weebly.com/uploads/1/3/5/3/135316004/mobuzabada.pdf
    • https://lizatupapej.weebly.com/uploads/1/3/4/4/134401074/7978703.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_2cd2898a48834931b69595587eb15c67.pdf?index=true
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_fdd776aebc0e4a2f99e0c3d5522b577d.pdf?index=true
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_3ae6ffa880d247c8af41601976c2de7b.pdf?index=true
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_cd9c839933f24051be1f17b20dc7d27f.pdf?index=true
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_47824de4e6454a7b8d6f432b7e171def.pdf?index=true
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_9c36ea8da8f84e4b83c6fcb4f07d190f.pdf?index=true
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_6822c8609f1e4ad7864098719c1d478b.pdf?index=true
    • https://8c330184-3457-40de-b162-e34763a77ed1.filesusr.com/ugd/0aae61_e2f63b612e02469e8be7841925b8277e.pdf?index=true
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_aa393076b9f045c7942e2e26eb6c0c85.pdf?index=true
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee0d.bin
08a09c8a69265450024bcab1cd4eaeacc7a39a115e7af0aa2ea02c9b6b4a7430		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0D 5428 bytes
font_01_sfnt_off0001007c.bin
a455eb190d3f9407b888fb490229902142e66dc9bdc1409a54543595ec8a7961		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 11340 bytes

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