Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff2431eab061385…

MALICIOUS

PDF

76.2 KB Created: 2021-03-13 14:51:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a42a46e240895cc075d82cdec9eebe42 SHA-1: 9f722b40c53cd3421732ead6e2bc42babfab1e1a SHA-256: 2ff2431eab06138544e30a1e06912b7b688249ece6db0a940daf2e99ccad9dc3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

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://mezovuduw.ru/strik?utm_term=el+pollo+loco+menu+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446374/normal_5fce74362c9c1.pdfIn PDF document text
    • https://risimapi.weebly.com/uploads/1/3/4/3/134321435/59d5f4aeb9d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405652/normal_5ff33c9b610e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_6025cb02c3f1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375704/normal_6038c21c462e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_603bc3201000b.pdfIn PDF document text
    • https://widijusadapabi.weebly.com/uploads/1/3/0/9/130969823/pevimir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385617/normal_6009655d00aac.pdfIn PDF document text
    • https://tenasedoba.weebly.com/uploads/1/3/4/3/134333827/8c177630c809a09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465949/normal_6036ae423ecf1.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/rakabexozu/bidibotofotek.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/dewalt_cordless_mitre_saw_home_depot.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/34853239152.pdfIn PDF document text
    • http://nowivopikuzud.epizy.com/4829552318.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/xesuw.pdfIn PDF document text
    • http://salekisaju.epizy.com/casio_ctk_3500_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/reforozibitoneverikab.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/closing_stock_value_in_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/74020757768.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/29599029648.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_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 4828 bytes
SHA-256: 9af9fe8d42da8185db22199c415f68a5be2a0c52520a9cc0216dfd5ae157da1d
font_01_sfnt_off0000fd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7E 11176 bytes
SHA-256: 94f5d0c7dd376d99baf280057624641fb59fe3554d1f60a5fd774d7b92374ecd

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