Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1be5caa8edef33…

MALICIOUS

PDF

70.6 KB Created: 2020-11-11 08:52:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1deb04e8346bff4a02e910267e499801 SHA-1: 1d0e5247606ce366db1cdec64e07269b888f40b9 SHA-256: 0f1be5caa8edef337f6a6457e14f20e5cabbe24b26eb3d686dac505064bf9375
214 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous embedded URLs, including one pointing to a known malicious redirector. The document's structure and the presence of these links suggest a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment. No scripts were extracted, but the heuristic firings strongly indicate malicious intent through URL manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?keyword=excalibur+ex-21+scroll+saw+reviews
    • https://lisiladojorinin.weebly.com/uploads/1/3/0/8/130874519/mipijevufegiwilemo.pdf
    • https://cdn-cms.f-static.net/uploads/4380701/normal_5f91f7a3e61ac.pdf
    • https://menuvudojowakap.weebly.com/uploads/1/3/4/5/134594867/4062290.pdf
    • https://cdn-cms.f-static.net/uploads/4499653/normal_5fab5d2883eea.pdf
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5f8a50812bd1f.pdf
    • https://cdn-cms.f-static.net/uploads/4413842/normal_5fa48b07e65bd.pdf
    • https://disadaniti.weebly.com/uploads/1/3/4/4/134463451/6993659.pdf
    • https://finejorokisitoj.weebly.com/uploads/1/3/4/4/134495390/volet.pdf
    • https://bonolofoguworow.weebly.com/uploads/1/3/4/6/134694868/5603844.pdf
    • https://dopozigixojak.weebly.com/uploads/1/3/4/5/134509916/dde1323588c9ea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/fd840d9b-cf52-4582-80bd-3571e4ffcf2c/27388484025.pdf
    • https://uploads.strikinglycdn.com/files/04d3ec49-ad28-49a0-889d-d60f1b166bd4/ash_gray_guide.pdf
    • https://uploads.strikinglycdn.com/files/f2733481-9518-4ddd-89df-62330d8c32bb/sasutekikovoxegiri.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc1f.bin
8d1eae75e412bd7d36c45289b86fc4911f330d3068d0661ee88dc8f5f32908cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1F 5020 bytes
font_01_sfnt_off0000dd63.bin
6140d0ff6ef1549c21c85ccd41034dec2b041ed0a8d27305ba9695d0a6d28cce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD63 10000 bytes
font_02_sfnt_off0000ff78.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 4324 bytes

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