Malicious PDF — malware analysis report

Static analysis result for SHA-256 836cec5a96d9845a…

MALICIOUS

PDF

70.7 KB Created: 2021-02-21 22:51:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: f76f8056354449cd88356e5e71d2ab5b SHA-1: e8e79b9cd212e6df2ef1a028b3956a74a43884b5 SHA-256: 836cec5a96d9845ab6b9c58439269019650dd06cae5e91f052ca19f2d8c7dbf6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URLs, such as https://maypoin.ru/strik?utm_term=is+the+hp+photosmart+c3180+wireless, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://maypoin.ru/strik?utm_term=is+the+hp+photosmart+c3180+wireless PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482020/normal_5fde4373c6a0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425738/normal_601eb74b36ae6.pdfIn PDF document text
    • https://zupusokez.weebly.com/uploads/1/3/1/1/131164352/1070266.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405413/normal_5ff1c7eb39da0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485702/normal_602c6aab7fe6a.pdfIn PDF document text
    • https://cdn.sqhk.co/jememobak/jgmx7aD/somufefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408478/normal_601e5dec48531.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/tumasun/zilemusazexuvugabelavale.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/final_countdown_sax_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/amnesia_switch_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/homemade_christmas_table_favours.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/extenuating_circumstances_form_ucl.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_off0000d553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD553 5752 bytes
SHA-256: 58c9b41003d18540126d54c23b0a5cc6ca187568377d5c099142c0ce4cdbc58e
font_01_sfnt_off0000e8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D0 10824 bytes
SHA-256: 2390ac643e88e7d192720bad90a6ae77045268a665dafe3af21055fb64f05dc1

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