Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c43ff8157eeb5b…

MALICIOUS

PDF

74.6 KB Created: 2020-12-22 09:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4df388c1ce572a79486a53e58cb04b54 SHA-1: 18f5a0b4615851d01f4e41f1f12ed93721ffacfb SHA-256: 63c43ff8157eeb5b189c14676da5418f552bb313eddc5b5a8c979c818a26f7fc
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to phishing or malware-hosting sites, likely leveraging a PDF exploit or social engineering.

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://gettraff.ru/strik?utm_term=border+control+officer+salary+uk
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/rolovedojikarag.pdf
    • https://soxixafefude.weebly.com/uploads/1/3/4/4/134434462/tuzuwowineveke.pdf
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/eac85730fb56439.pdf
    • https://fosarujup.weebly.com/uploads/1/3/4/6/134624161/zisemirodakoke.pdf
    • https://tojaluteder.weebly.com/uploads/1/3/4/3/134384479/sawerukumofobu-netukabuduj-xamaxibafunalem-xesele.pdf
    • https://cdn-cms.f-static.net/uploads/4392862/normal_5fd790abc0fa4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xalasawu/sustainable_development_goals_report_2019.pdf
    • https://uploads.strikinglycdn.com/files/4c9b95ce-c57a-4743-8a08-c37e9b09d3d3/jutunamo.pdf
    • https://uploads.strikinglycdn.com/files/72e35636-f176-4264-9890-da9dcf246f51/tewilufuvepetadubagivos.pdf
    • https://s3.amazonaws.com/xajowu/zafufuxuwezaluzisisu.pdf
    • https://uploads.strikinglycdn.com/files/c245544e-92a4-45c2-a0e7-0519788bf240/new_year_clipart_free.pdf
    • https://uploads.strikinglycdn.com/files/1c95c258-a3fc-483d-a3e0-255822144b1b/wipol.pdf
    • https://uploads.strikinglycdn.com/files/48455665-044f-4817-a776-3d9affc45cd1/mystic_river.pdf
    • https://uploads.strikinglycdn.com/files/fa979716-c6d5-4c81-8dfe-d6c866d67bae/folivomujurituvutoma.pdf
    • https://s3.amazonaws.com/mipeboro/bicycle_the_definitive_visual_history.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e68f.bin
fdac38cfe5a421af5f1ed0329de03601e52d45f931b2e1b34a974e0761bfc11c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 5228 bytes
font_01_sfnt_off0000f87a.bin
59090b892ede5ac8a5fc15d360857d5d1c9775ec17837ea0440ccbee86761a58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 11188 bytes

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