Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff333e51289927de…

MALICIOUS

PDF

68.2 KB Created: 2021-01-01 00:11:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9045c6334b712aeafcb8d44bc5f89fd8 SHA-1: 297ee4e925f577024984e13b48d01e5a83f640d4 SHA-256: ff333e51289927de055c9e5887cafce4767e2b72efcc0fea7d4648679a31e1a4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffset.ru/strik?utm_term=galaxy+invader+alien+shooter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383471/normal_5f9433344b6ef.pdfIn PDF document text
    • https://rixeludabigadak.weebly.com/uploads/1/3/0/9/130969597/kaxutipogugeje-tabofixiwezoxom-xaledisesipenik.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/1816054.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374189/normal_5fb3c6f251f7f.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/zifilobesumafi/kekumezagesaxotipirekiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f7c63b-eecb-4d8f-ab25-65e3c14e923a/pesilexukev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0485a946-6497-418f-9e41-c2769732b5f0/1409617158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/644b8ac3-67ba-4cd0-a097-c3ea5a2540b9/flame_gymnastics_academy_hours.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19bd40d0-57b0-4bbe-9101-c4905cf4fe47/whos_afraid_of_virginia_woolf_book.pdfIn PDF document text
    • https://s3.amazonaws.com/dirijazi/create_my_own_cursive_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/83063798132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6418b83-8d11-4ea7-924a-190a9f654b27/3820771384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/680e2542-2da5-468f-ab5d-8978591a1e71/kapitenuloxiwi.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_off0000ce81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE81 5172 bytes
SHA-256: be738dbdf63b46e345f158805f9ce7609aeae87629da7de32a62e1bbbf2a85b9
font_01_sfnt_off0000e01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01F 10720 bytes
SHA-256: 81dc9eb6d0e73b2c0a56d591f240b6e9dbf43a1c2d0162568ab933a950a242b2

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