Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dec9f5eb89c28c3…

MALICIOUS

PDF

100.0 KB Created: 2021-02-18 19:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 3ff23053fa883661e1c433304a193ce9 SHA-1: 5807bea34012aa91a2c5d01542b58e6badf2037b SHA-256: 9dec9f5eb89c28c3d9d5c76086b21c9157434e6e5b4d808f9c609f012d97f4d6
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated and appears to contain junk data, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic indicate a malicious intent to redirect users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/strik?utm_term=arifureta+light+novel+volume+10+english PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450638/normal_5fe45a5b91957.pdfIn PDF document text
    • http://foodguideblog.com/15190773741i542f.pdfIn PDF document text
    • https://safalijig.weebly.com/uploads/1/3/1/0/131070993/jajerukijeziraf.pdfIn PDF document text
    • https://nusuxoxoli.weebly.com/uploads/1/3/2/7/132710665/53cf45bb279763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_5fd6eee581b05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453563/normal_5fd2ed9874691.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_602387b4d68e0.pdfIn PDF document text
    • https://nakojuxipesasam.weebly.com/uploads/1/3/0/7/130776326/xikupotupopenu.pdfIn PDF document text
    • http://streamsweets.com/146922100668npml.pdfIn PDF document text
    • https://kibidabusiben.weebly.com/uploads/1/3/1/0/131070702/vodas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384645/normal_602729068324d.pdfIn PDF document text
    • https://cdn.sqhk.co/pixukinoma/hajbxGF/civcrafter_what_do_cats_do.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409114/normal_600c88b155f30.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/folexapurilowe/90370123731.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/46116020878.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/20116166328.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/63276023730.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F5 6504 bytes
SHA-256: fbd380e45699ae44f4a109a1d56a5dac55e5190bc4a19bdb7f7cd19f59374f98
font_01_sfnt_off00014a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A59 5424 bytes
SHA-256: 466b182190adddc7c5d0a6d05e4f16801c7f0b964b15ee99cf347b7806e2e03b
font_02_sfnt_off00015caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CAA 11024 bytes
SHA-256: f24bf20ae7aced23152e1817e83e175d4aca6019b992fb0d1bc672da63b4f6b8

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