Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ba550d0dfd7211…

MALICIOUS

PDF

76.3 KB Created: 2020-12-25 20:15:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: da948688cf6fe8c778035d0535412367 SHA-1: dfb36245e46dc52ed681ba560d1ae157b5c849a5 SHA-256: 71ba550d0dfd7211373ccdddeb4b2d0cd797f3c5ae56b054ac44d77b6285bcd9
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ClamAV detection and ML classifier also indicate maliciousness. The primary attack pattern involves directing users to external, potentially malicious, content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/aws?utm_term=does+bovine+spongiform+encephalopathy+cause+alzheimer%2527+s In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384851/normal_5fbebd362f070.pdfIn PDF document text
    • https://bilewobadazape.weebly.com/uploads/1/3/2/6/132695578/jedijigov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421365/normal_5fc517a0d50be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f87573acc3f2.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/zuxadol/88587223230.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/pimenidilofakiki.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/newonoxezomejaxixesom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79877521-6c87-4ece-a4b5-404d401a3d0c/timeline_clipart_black_and_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5a699be-fc8c-4704-bbd3-6fdf4059c4eb/fowuwanorib.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/63090484906.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/kevawexebozinazemuvim.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_off0000e9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 5812 bytes
SHA-256: 4e0e2ffdcf7d4139554158267372a824e61a0de8d1ebe0dddb6a22dcd706c8af
font_01_sfnt_off0000fd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD89 11244 bytes
SHA-256: ffa135993e42b1d67e8829f33c76e595ecc44a062a45a50944e80407cd05a54b

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