Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f9164b637f9cf1…

MALICIOUS

PDF

78.1 KB Created: 2021-01-01 14:32:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3fc50bad2c3eca240fd1b133a53b0bde SHA-1: 7bd6285556062d075e843e113eb0f319793ceb9f SHA-256: 54f9164b637f9cf1b13ac1902e70f29ae6c067789684058c98251ba7819afc45
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. ClamAV also detected the file as Pdf.Phishing.Trojan, and an ML classifier flagged it with high confidence. The presence of embedded URLs and the link farm structure suggest an attempt to direct users to malicious sites, likely for phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=arshin+mal+alan+film In PDF document text
    • https://cdn.sqhk.co/sigidezok/c1rEJii/zikixumonexesoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372105/normal_5f92b91100ece.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383797/normal_5f938f345a73f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460709/normal_5fdf4ea52561e.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/6894496.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wufujudisu/backup_entire_android_phone_to_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/fifo_calculation_excel_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3785879-ba3d-413c-b11f-4eda4a94139c/27228920414.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/sivitorulinexokeke.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/gofajonejojubo.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/84038358336.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 4476 bytes
SHA-256: a8cb53de60dae3238b6d6cff0758335f48bfef75e9f3cc39cc13c6d739541ac7
font_01_sfnt_off0000fac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 10208 bytes
SHA-256: 97e4b69d3ea019716c408255b918cf15861dbe205b7c086f6714d4591237ad34
font_02_sfnt_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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