Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0db0db19b3e34b6…

MALICIOUS

PDF

76.4 KB Created: 2021-05-25 10:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3236a2fca4b492eeeb034eb87664c7b SHA-1: dd07009cf6f293e7d9200b1e2130965c3d59c4be SHA-256: c0db0db19b3e34b6d0f251680a0471acfee67861557ca09f05a704ef91f63095
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic indicating a mass external link farm, with one prominent URL pointing to a suspicious domain. The document body, though heavily corrupted, contains text related to opening an 'airtel bill without password', suggesting a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://soxebez.ru/strik?utm_term=how+to+open+airtel+bill+without+password
    • https://dotofufodil.weebly.com/uploads/1/3/5/3/135313806/doweduti-kifefedupi.pdf
    • https://static.s123-cdn-static.com/uploads/4490116/normal_5fcdc6094976b.pdf
    • https://bexulijariva.weebly.com/uploads/1/3/4/8/134885506/3399411.pdf
    • https://wukajimodowel.weebly.com/uploads/1/3/0/8/130874313/feweninabiriv.pdf
    • https://kutufexefe.weebly.com/uploads/1/3/4/6/134695169/witigaror.pdf
    • https://fuxexitir.weebly.com/uploads/1/3/4/0/134098624/xaluxoxamejavo_dikolajowur_zonuruvofijo.pdf
    • https://xajakubadom.weebly.com/uploads/1/3/0/8/130874473/249433.pdf
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/melewutonezifajem.pdf
    • https://wozibasibif.weebly.com/uploads/1/3/4/8/134868806/243239.pdf
    • https://cdn-cms.f-static.net/uploads/4421768/normal_6065b2af1d6bf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jivala/free_inference_worksheets_for_3rd_grade.pdf
    • https://s3.amazonaws.com/dekogamik/bafukadevomafi.pdf
    • https://s3.amazonaws.com/sajatofubote/ra_un_nefer_amen_metu_neter.pdf
    • https://s3.amazonaws.com/padadutiseni/center_worksheet_horizontally_in_excel.pdf
    • https://s3.amazonaws.com/tedowafomaru/dialogue_allemand_franais.pdf
    • https://s3.amazonaws.com/pogolo/72520358555.pdf
    • https://s3.amazonaws.com/juzinaramip/gabibub.pdf
    • https://s3.amazonaws.com/wujixus/dipawaw.pdf
    • https://s3.amazonaws.com/sorogamat/attestation_de_formation_continue_obligatoire.pdf
    • https://s3.amazonaws.com/rebomedug/86215018490.pdf
    • https://s3.amazonaws.com/sinamozagemoger/admission_form_2019_lucknow_university.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e42e.bin
0199499c659d1a8f7d8ad58ee6a57d2af17a0d500bb39309a36193b7321f7681		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 5240 bytes
font_01_sfnt_off0000f5f3.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F3 1800 bytes
font_02_sfnt_off0000fe80.bin
1c2bb3d1c785794cc4b69242083698b243ca85d2721318e0894133bb7b5ead46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 11040 bytes

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