Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8859a11bc8d53ca…

MALICIOUS

PDF

74.2 KB Created: 2021-05-27 10:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f0bca600f0641d9b07845ce7eccb8cae SHA-1: 117ec361a69026e8cedc894aa652289950cf86b2 SHA-256: c8859a11bc8d53cae7a765eb5b75276c362555aa3499e56fd22bb94700a1876b
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=what+are+the+different+types+of+pile+foundations PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481695/normal_6063cb8850236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372702/normal_603cb885eea82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_606be696c6bef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382952/normal_605af5bb9bd3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_6014b09caf0f8.pdfIn PDF document text
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/3584243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527902/normal_6046476c41576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393631/normal_603e19d4db9e8.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/sitelubezav.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/c737dcceb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426550/normal_6052ba7714309.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410431/normal_6007a18d2aecf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381971/normal_5fd322c9ce996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484631/normal_603c3e0b391c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5fd63b9bc5a5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ba9472-c16d-4a45-9fa9-faf9f43d10c5/pufafawumekedur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31711f9b-cd0f-4364-b559-f4e9bbb12e7f/voruwizepanavet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c576de5-b478-44aa-ad7a-6a4892e072b6/38256372797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6ede431-8f86-4471-8d09-7d477863e842/32930998750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff279b5-6965-4931-9bb8-0cb829253ac7/how_to_google_search_for_an_image.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_off0000e57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 5244 bytes
SHA-256: 5895538461a1d5649a2e1ec5fec88181c142c0ba67f62447d291f64435f498c5
font_01_sfnt_off0000f762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 10468 bytes
SHA-256: 7abe051163ffd371d1c0cde22f0d43ed9df6aa63e1e5b766f79405911ffe9ffe

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