Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4cc1f5fc12c6dd…

MALICIOUS

PDF

66.2 KB Created: 2020-11-18 09:05:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4b04cf130174779b665b99786f6c26e5 SHA-1: 55d350c44ca087610ff0afc84035137db5565104 SHA-256: 1b4cc1f5fc12c6ddf4f769511776cdd0c3b2d47639f240669d48ff39564e3194
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to redirect users to phishing or malware download sites.

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://ggtraff.ru/strik?utm_term=el+viento+del+norte+y+el+sol In PDF document text
    • https://jidedenevunuva.weebly.com/uploads/1/3/4/4/134498736/f1053ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417046/normal_5f976e45ecfb2.pdfIn PDF document text
    • https://gifezimudafero.weebly.com/uploads/1/3/4/3/134312010/dirababuwekovowuzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_5faec68bc9bbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_5fa9d681c1263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423171/normal_5f9efdaf271fa.pdfIn PDF document text
    • https://kirasupi.weebly.com/uploads/1/3/4/4/134442552/gemedazawaw.pdfIn PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/1365092.pdfIn PDF document text
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/fdf17a0.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/gaxuremewuger/hungry_hungry_hippos_game_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/jigijiwafiwigekoluzenod.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/6212865466.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/firawu.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/25285636724.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_off0000c4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FD 4728 bytes
SHA-256: 960b43947eac02c9abf63d6f3db3f0e3139562ce8079d578e76e51c3e8793123
font_01_sfnt_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 11448 bytes
SHA-256: 9e5290343e1e34412676b82e62499cc78995184b2d62d7a720d9ee490146b5f9

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