Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3751c2238fc2cbb…

MALICIOUS

PDF

78.2 KB Created: 2021-03-11 11:26:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1472aebed91799d25d0dd3de25291653 SHA-1: 5233020318e5c01165f5219f5f3abe08af561c12 SHA-256: c3751c2238fc2cbb025054f78cfc717f67852f81289217380bbe0dd36183859b
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The document body, though heavily obfuscated, appears to be related to a 'smart irrigation system project ppt', a common lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://botokaw.ru/123?utm_term=smart+irrigation+system+project+ppt
    • https://rigabobavotul.weebly.com/uploads/1/3/1/8/131856161/d8ef368.pdf
    • http://takotonefajale.22web.org/consumer_reports_vacuum_cordless.pdf
    • https://cdn-cms.f-static.net/uploads/4486368/normal_6019c790cc3ab.pdf
    • https://piminudoligot.weebly.com/uploads/1/3/4/6/134688392/2e90b1.pdf
    • https://nafepamozox.weebly.com/uploads/1/3/1/0/131070284/juzuru.pdf
    • https://cdn-cms.f-static.net/uploads/4369502/normal_602aef9ae6f68.pdf
    • https://luwagibefex.weebly.com/uploads/1/3/5/9/135966535/e9bb6.pdf
    • https://jewutejaj.weebly.com/uploads/1/3/1/0/131070173/70ade886b0e.pdf
    • https://nibonitet.weebly.com/uploads/1/3/0/7/130776737/1551720.pdf
    • https://static.s123-cdn-static.com/uploads/4420244/normal_5fc9a1a09c652.pdf
    • https://teputire.weebly.com/uploads/1/3/0/8/130813428/1485893.pdf
    • https://kebumemimax.weebly.com/uploads/1/3/1/6/131636814/najor.pdf
    • http://lomikoju.22web.org/average_logo_design_cost_2019.pdf
    • https://cdn-cms.f-static.net/uploads/4454808/normal_6040662378811.pdf
    • https://static.s123-cdn-static.com/uploads/4474979/normal_5fca8e1d5eb89.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zitegarapopufis.rf.gd/dosamirivejilixebugujivo.pdf
    • http://potazerupew.rf.gd/10788501538.pdf
    • http://nunoxemimo.rf.gd/chemistry_lab_manual_for_class_10_cbse.pdf
    • http://luredavum.epizy.com/city_of_stars_piano_free_sheet_music.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_off0000e997.bin
5541c9773570956bacc63b478d61844d812e02c544224c5d6b99a6c7ba39ea29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 3440 bytes
font_01_sfnt_off0000f5e3.bin
dc68d39f886bee2cd8016aa9dfb18904c49c7bfe29711c5bf6951533bb0f5837		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 5500 bytes
font_02_sfnt_off00010893.bin
11adc7bb864a64561ec9cf009527f5db10ef0a662f967297965e4e95427b784d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 10148 bytes

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