Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd864433687ff2d9…

MALICIOUS

PDF

68.1 KB Created: 2020-12-11 06:52:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e67cd42273b8605c1add2c36d568a722 SHA-1: 9de51e1f7afa78504398a1078e90429e69862300 SHA-256: cd864433687ff2d9ecd95bd973156e6a8e2b1feac9f91415439af764669ad2b9
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://traffine.ru/strik?utm_term=cite+the+law+of+reflection PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486534/normal_5fa999da1415d.pdfIn PDF document text
    • https://xabolagusi.weebly.com/uploads/1/3/4/6/134631680/8330702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382430/normal_5f96138beca7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5fbc6697165f5.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/71c06a4b-58d6-45fd-aaed-658721302993/34434492913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bd524ce-e354-4fe3-a010-2d0698ea8a0e/non_christian_easter_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2046a9de-0041-4089-8ffd-688fc76f4921/coadvantage_tampa_fl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80ad997c-09df-493f-a5a5-0c825d550b6e/luniguwediromuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e38ca5b1-d84d-4ea1-9783-88fdf1c2ae8e/mulakazibopitigenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe524c00-89e0-488a-8ba1-3a5c4577fad1/aws_windows_cal_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af67accd-f2f0-4865-879a-42edebb831c9/pampered_chef_rice_cooker_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81e90afb-c65c-4c5c-a1fa-beb7f3fcc636/70249108431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/253d76cf-00fc-4d17-a64c-9341ee93daa3/pasadosudak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5859004-4c7e-4459-aa44-1c5971791c15/42905661275.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_off0000cb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB81 4788 bytes
SHA-256: ca97187176a808713219d36000a55296c70f1f4ef9cad2cd1e8e1c7bba4735e8
font_01_sfnt_off0000dbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD6 11724 bytes
SHA-256: 786132c87a6cb36a6176ef6f779f35349674a6f637797d3099f2bed1b07181f6

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