Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfe5c3cb6b3f7ae…

MALICIOUS

PDF

83.2 KB Created: 2021-05-31 10:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23a6288b5b3f46444de30bf8c518ec79 SHA-1: 413d46c41aa071a2caaf260ec522242ca758939c SHA-256: 0cfe5c3cb6b3f7ae6fe16cafbbea54f059db46994dbe06f8399e5d0756ac6ae0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains a large number of external links, many hosted on Weebly, suggesting a link farm or SEO spam operation. The embedded URLs point to various PDF files, likely intended to redirect users to malicious content or phishing sites. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=what+are+the+different+types+of+tender+documents
    • https://rajerese.weebly.com/uploads/1/3/4/3/134387708/robonorufev.pdf
    • https://rofekituluz.weebly.com/uploads/1/3/2/3/132303072/3382607.pdf
    • https://maxugiveworupuf.weebly.com/uploads/1/3/7/5/137513679/jalisatabutus_nuzozizubisame.pdf
    • https://cdn-cms.f-static.net/uploads/4497372/normal_606aebf064071.pdf
    • https://bojebunu.weebly.com/uploads/1/3/0/7/130775379/xodan.pdf
    • https://static.s123-cdn-static.com/uploads/4488804/normal_5fe2567851258.pdf
    • https://mokomopepu.weebly.com/uploads/1/3/5/3/135333670/6091978.pdf
    • https://jexenixikejov.weebly.com/uploads/1/3/4/6/134632916/396975.pdf
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/suroxa.pdf
    • https://biwoponafi.weebly.com/uploads/1/3/4/7/134767969/gukijevaropepuz.pdf
    • https://paduxadoduxim.weebly.com/uploads/1/3/0/7/130775016/zowusafexosa.pdf
    • https://rejudizik.weebly.com/uploads/1/3/4/7/134701546/8679935.pdf
    • https://vuvudarekiw.weebly.com/uploads/1/3/4/0/134017261/jatuxewinesibid.pdf
    • https://cdn-cms.f-static.net/uploads/4370791/normal_603763259f042.pdf
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/4c7f8c17f0dcc7d.pdf
    • https://static.s123-cdn-static-d.com/uploads/4471235/normal_60b000b73eaba.pdf
    • https://cdn-cms.f-static.net/uploads/4470698/normal_6018789ef30f3.pdf
    • https://cdn-cms.f-static.net/uploads/4393644/normal_60301e1fa9d90.pdf
    • https://ronojunigamedez.weebly.com/uploads/1/3/5/2/135297775/xomejebenolu.pdf
    • https://cdn-cms.f-static.net/uploads/4385004/normal_5fd3b667d01ea.pdf
    • https://vokudaminovisuz.weebly.com/uploads/1/3/4/4/134495340/zabaposunumutav.pdf
    • https://jixeneneme.weebly.com/uploads/1/3/4/0/134096386/jejodagijawab_wujabemipawedit_lubub_livogetop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c223db49-e315-44cc-b114-5378a29c29b4/mupovumato.pdf
    • https://uploads.strikinglycdn.com/files/69059051-c45f-48d8-8726-58aea8539857/6192742981.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_off000103b2.bin
c7ca75fd22c6c635574c374efaabae8218b1afe2d0acf91c181bb0b8b29ad315		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 5480 bytes
font_01_sfnt_off00011642.bin
fbd985aa994e71dc0e5ac8164c79425f8f03de01437e3727396514a7224faf34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11642 11692 bytes

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