Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2483b683ec64d0…

MALICIOUS

PDF

73.2 KB Created: 2021-01-06 03:06:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 587b1581937602926b436a0d3361bf48 SHA-1: 8081109523b6d79471ba1ff997a373504a791a91 SHA-256: 5d2483b683ec64d02fe2324790b7526bb6a4bc159a1dfc3dad0afeed2edc781a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicative of a link farm or phishing attempt, as flagged by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs suggests the document is designed to redirect users to malicious websites, likely for phishing or malware distribution.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/aws?utm_term=advanced+engineering+materials+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365628/normal_5fc85084101fb.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/lOFjbUg/free_hd_movies_download_sites_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_5fe9036a8ee69.pdfIn PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/juvizor.pdfIn PDF document text
    • https://zedetebi.weebly.com/uploads/1/3/1/0/131070456/dumazovutunaxenazig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426072/normal_5fb44e0a77d17.pdfIn PDF document text
    • https://cdn.sqhk.co/lenawemijixe/6uahjge/drive_in_theatre_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_5f88812cc203f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418579/normal_5febaafe17636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5f88edad2b914.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/7hgHyw3/32872431742.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393370/normal_5feb44a5034ce.pdfIn PDF document text
    • https://femuketidoxesi.weebly.com/uploads/1/3/3/9/133997502/5036544.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/kasuwevovog/50512121661.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/renabitozomurojap.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_off0000e00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00F 5524 bytes
SHA-256: 6c6b62f803ae2997e2f8cf3eaab6f9827df60045d25c48f58acd73a895358da1
font_01_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 10948 bytes
SHA-256: 81be192f19ff4ec6f7f7406fabf37ebc805d69c14556311ac66769e5e44653f7

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