Malicious PDF — malware analysis report

Static analysis result for SHA-256 15341b46a4048053…

MALICIOUS

PDF

79.2 KB Created: 2021-02-12 09:56:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b230d3eb82074c8a04d6e9876d5d70b9 SHA-1: 9eae475c5d0d2461c121dae0206ecb2a8c3db840 SHA-256: 15341b46a4048053b8d2e428f7718e49e49e0a89b9b220ab1fb86888f151c281
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or conduct phishing attacks. The document body, though partially corrupted, suggests a lure related to installation guides, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=vista+20p+installation+and+setup+guide PDF link annotation
    • https://cdn.sqhk.co/sirejeforox/PZDjgje/xudobedib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479462/normal_5ffbadaf64701.pdfIn PDF document text
    • http://itawegan.fun/android_emulator_for_win_7_64_bith1k2n.pdfIn PDF document text
    • https://cdn.sqhk.co/gasubapo/Dibjdjw/25629499779.pdfIn PDF document text
    • http://naturebiolog.fun/94375799946mk04n.pdfIn PDF document text
    • https://cdn.sqhk.co/sononipo/jgf6ahg/fidget_spinner_pro.pdfIn PDF document text
    • http://somukegizos.66ghz.com/sound_recorder_free_for_windows_8._1.pdfIn PDF document text
    • http://kayikciakademi.com/56941454611yn29z.pdfIn PDF document text
    • https://nowiwadigomu.weebly.com/uploads/1/3/4/0/134018048/popiwogubufaditufi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459922/normal_60243051381af.pdfIn PDF document text
    • http://onlajn-kassa.ru/yugioh_neuron_pcv5mqb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422876/normal_600d11dbb442f.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/jijeoji/jakafi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454825/normal_5fee18a392610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393639/normal_5fd11f9620b1e.pdfIn PDF document text
    • https://cdn.sqhk.co/litawoxelida/abhbv8Z/canary_bird_lifespan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wazododasexixak.rf.gd/busbar_design_calculation.pdfIn PDF document text
    • http://guruwemuzotal.epizy.com/active_directory_connector_oim.pdfIn PDF document text
    • http://kesufelitam.rf.gd/putowolip.pdfIn PDF document text
    • http://negavutagogo.epizy.com/81994515062.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 5272 bytes
SHA-256: e2283480b4aaddde9fb87d34319a0f2c2513c5c9c90932e9980d26538ec7b534
font_01_sfnt_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 13680 bytes
SHA-256: 0c4c5380eb2bc51ea83fa7968de694369b5efafa4994be068751745581c9e7ed

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