Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa3cc2600efe2ca…

MALICIOUS

PDF

87.7 KB Created: 2021-05-18 23:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f24108b317fdf2c2984fb6be15fc964b SHA-1: 4d133ef0f6fe122d733bfee8b18beb1b66e143f0 SHA-256: afa3cc2600efe2ca72ca68c6638cc704ff69c98c3123886ab6f4e19c16d5f749
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the document body's deceptive title point towards luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=can+python+be+used+for+data+analysis PDF link annotation
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/juruveni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496818/normal_601a42cf49c6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481411/normal_5fe01c8e25d21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_6046a29cb7e0b.pdfIn PDF document text
    • https://manoduxasef.weebly.com/uploads/1/3/4/0/134041035/fulejexisiduwaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490264/normal_601edb018704a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452607/normal_6052ab03354b2.pdfIn PDF document text
    • https://miwebuzoz.weebly.com/uploads/1/3/4/0/134095964/foneredoleximokupi.pdfIn PDF document text
    • https://movalibixijol.weebly.com/uploads/1/3/2/6/132682530/ad7115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448542/normal_601dd89568b27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384470/normal_604d77b395b91.pdfIn PDF document text
    • https://pugotadarasab.weebly.com/uploads/1/3/6/0/136094286/3cd5d.pdfIn PDF document text
    • https://tetunabirudav.weebly.com/uploads/1/3/0/8/130874278/vebiwago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419822/normal_60309a8e762fd.pdfIn PDF document text
    • https://fidagavatijib.weebly.com/uploads/1/3/1/3/131398583/178293.pdfIn PDF document text
    • http://giwapuse.22web.org/totunewole.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5ff47f3f4a137.pdfIn PDF document text
    • https://zomedavox.weebly.com/uploads/1/3/4/3/134392748/f02c6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/58203226767.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/63534954590.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/42862145221.pdfIn PDF document text
    • http://pofomabagemekut.epizy.com/fanivirozo.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/breve_historia_de_los_estados_unidos_philip_jenkins.pdfIn PDF document text
    • http://sokiguxesixup.epizy.com/agua_de_beber_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/tajedosesa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 5276 bytes
SHA-256: e9a57e77d539e2601c443a7f50dc293a7e83b2a06fa52b3bc167258d52bd0b7b
font_01_sfnt_off000109ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 2484 bytes
SHA-256: 909920d59ddcd7400d5b16728594da0562fc837a6481ae8da612848d2627a5f6
font_02_sfnt_off0001148e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148E 10984 bytes
SHA-256: 30312831e7fc9c366d7841f1686ce863b40a520e6c8357d8040f19d7a3b60ad4
font_03_sfnt_off00013a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A56 16492 bytes
SHA-256: 3ace622194002f38be14bbfe8fb4b5cf519fc16b238c32d30c1da3dd45bedfb6

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