Malicious PDF — malware analysis report

Static analysis result for SHA-256 d413616b06519f2b…

MALICIOUS

PDF

76.2 KB Created: 2021-03-21 10:47:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 731fac46f307f851e05163577f87bf5f SHA-1: ea48afb094b27b5275da962a8098dd480e051cc8 SHA-256: d413616b06519f2b3dfa5d70bc90fe26dd831b89338c500d5217898cc1f6d952
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/123?utm_term=smallpdf+pdf+para+ppt
    • https://cdn-cms.f-static.net/uploads/4405899/normal_60437baf1f642.pdf
    • https://cdn-cms.f-static.net/uploads/4411481/normal_5fda2a1ce81d0.pdf
    • https://static.s123-cdn-static.com/uploads/4492575/normal_5ff9e0a0c52a0.pdf
    • http://gixipures.sportsontheweb.net/sugejidipugabaxufepewasi.pdf
    • http://nemosixumeki.mypressonline.com/dulimuwawe.pdf
    • https://cdn-cms.f-static.net/uploads/4368951/normal_600f5942ab2d3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/viwoxuz/ravub.pdf
    • https://uploads.strikinglycdn.com/files/42f22629-c2aa-45f3-9c4a-206b7f40bc3a/death_and_the_labyrinth.pdf
    • https://uploads.strikinglycdn.com/files/90135b58-dfe0-491e-8231-4c828afff928/wukipumimisiwanawegotixal.pdf
    • https://s3.amazonaws.com/xijalovelokolep/reform_balkenmher_messer.pdf
    • https://uploads.strikinglycdn.com/files/cbf28c9f-0abe-4a56-ac28-a0545db2dfba/how_to_start_using_wacom_tablet.pdf
    • https://uploads.strikinglycdn.com/files/63888cd9-8e6e-4d38-b3bb-ade08331ba6f/kenmore_washer_70_series_wont_spin_or_drain.pdf
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_ae0a50ecfb894bd6bd72635143af9de8.pdf?index=true
    • https://s3.amazonaws.com/zaxawetawupo/56847378154.pdf
    • https://d74058ad-8c31-4576-aeb4-582a73b10e1e.filesusr.com/ugd/666c83_879dc9818d1f4a889857833140cffe7a.pdf?index=true
    • https://s3.amazonaws.com/vufuzewasi/fobabel.pdf
    • https://s3.amazonaws.com/jivagajamav/typhoid_fever_blood_test_report_sample.pdf
    • https://s3.amazonaws.com/punagilelabon/petty_cash_form_template_word.pdf
    • https://f856bbc4-01c8-45e4-8891-a53c5ee59fd0.filesusr.com/ugd/8e827e_3a43d7fcd7ec47e1923039e00997ee77.pdf?index=true
    • https://s3.amazonaws.com/xukonakefules/50062814641.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd4.bin
7ab72678ff2881e58ba52d11c8f6985a236d8fbad46ed769f49a146da1241f2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 5112 bytes
font_01_sfnt_off0000fe20.bin
3ee400bf829ec300d554a464c42d362bf62065efeec06baae251843cd8f3d319		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 12120 bytes

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