Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbff235eceb37065…

MALICIOUS

PDF

80.6 KB Created: 2021-03-18 14:37:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f5a7f98072cba5fbe034263df898cb3a SHA-1: a6e57c8137b9f0f0c53e525bb7dfa5700a05da1e SHA-256: fbff235eceb37065da04a87a36f6e9ef3ea33ec2514b5b6f4b881e668563ad45
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/strik?utm_term=on+managing+yourself+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426815/normal_6032cda43b03f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393514/normal_604711f70ff0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450504/normal_5ffc10ed98b01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469375/normal_5ff5784fc291d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444623/normal_60247ceaf279d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379722/normal_5fe4037c98fbe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488323/normal_5fee43c922153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479226/normal_6047be40425f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453105/normal_5fcd70698a05c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384464/normal_5ff222c24a97b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450889/normal_5febe575586f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410674/normal_5febcf7d8091a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466411/normal_5ffc1916aa81b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475847/normal_5fd90154c1c97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taxisariwoboduz.epizy.com/braveheart_bagpipe_sheet_music.pdfIn PDF document text
    • http://rejufamux.epizy.com/lazibadudetilivawewok.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/vitiguresorej.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_4ca1af69e6fc46b7a97fce08993ac232.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/tijisute.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/80350408830.pdfIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_ca1bd6a92b974594847afa3700c5ae48.pdf?index=trueIn PDF document text
    • http://xetobagog.rf.gd/pepegu.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/kibimimikivud.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_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 5580 bytes
SHA-256: 88eb2ab7d15fa099bf2dd0e05fa6ee2754b6134608953c38b0f7df0f6b7a034a
font_01_sfnt_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 14672 bytes
SHA-256: 4a2a2901b29f42843c7635584424a6ced8aef697ac995082b4e3c774d0dce59a

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