Malicious PDF — malware analysis report

Static analysis result for SHA-256 f646d096a346edd4…

MALICIOUS

PDF

73.8 KB Created: 2021-02-20 09:06:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8d234d4c2ef89f26f02d6f7a9c8bd784 SHA-1: f8651b1c4314ca58497e78b684ced45ac4c2c25d SHA-256: f646d096a346edd461c6e46c29a8c39581b068b20ba26b932cc52530bd200f47
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, indicating a link farm strategy. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs suggest an attempt to redirect users to potentially malicious sites, possibly 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://druttle.ru/strik?utm_term=cuales+son+las+reglas+de+acentuacion+de+palabras+graves PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392660/normal_5fe2036e0de86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493201/normal_601f9ab0845e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404990/normal_6000b30aa3108.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422912/normal_5feb3239c1e50.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/fhc4Tnj/panda_express_store_number_near_me.pdfIn PDF document text
    • https://gotukedefiwukub.weebly.com/uploads/1/3/5/3/135309477/riwopuxawipokesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481825/normal_60303366210d9.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/hgghbid/bemowobizibubod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413973/normal_5fe6402baa02a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383327/normal_5ff11720c0272.pdfIn PDF document text
    • https://xepapure.weebly.com/uploads/1/3/4/3/134367208/zuxonulata_vedukele_komibogox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403681/normal_5fcdf9d781b0d.pdfIn PDF document text
    • https://cdn.sqhk.co/zapimafe/ighagdp/gajisez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_6013a5180a91b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5fd0e588ed847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476281/normal_5fe840a9908d6.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/lekelepowo/adobe_pro_10.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_off0000e085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 5344 bytes
SHA-256: d6b7a01d1b1cd20b4c22b3ec644d0736e79a15513d744a860f6e14146d4f0cf0
font_01_sfnt_off0000f2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BA 11392 bytes
SHA-256: 3ec7edb27bb24229003a35737c0d51b0b92dd1dea8390bd46473ba31fba3a170

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