Malicious PDF — malware analysis report

Static analysis result for SHA-256 3533b03e015ac6e9…

MALICIOUS

PDF

73.1 KB Created: 2020-11-13 15:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 14a594d92afb681074b04435203298ee SHA-1: d1394c74062ee1010e706ec66112939bf773499c SHA-256: 3533b03e015ac6e9f30b7a6f43cfb2d0dad743db295f1ac5e7c5a7ac6eb33e09
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/strik?utm_term=spine+2d+crack+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389370/normal_5fa9a9063a8d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_5f8763523e074.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/jaferuwisu-gekufuze-xununamoso-kuminita.pdfIn PDF document text
    • https://xufizigox.weebly.com/uploads/1/3/4/4/134479456/vinuzupazapifa.pdfIn PDF document text
    • https://gixapogaruxa.weebly.com/uploads/1/3/4/3/134331356/soxonixonujipabikum.pdfIn PDF document text
    • https://wabozejitikaz.weebly.com/uploads/1/3/4/4/134495441/dudazudenuza.pdfIn PDF document text
    • https://luvupomadimudux.weebly.com/uploads/1/3/4/3/134350134/4805b7.pdfIn PDF document text
    • https://defagetomorig.weebly.com/uploads/1/3/4/5/134576552/9156232.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/7cc1ab36-2ad6-4792-84cd-cb00ac218611/how_to_connect_psvr_camera_to_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43cf8888-406b-4589-a163-fce1dceab4e0/20543822325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c9fd041-efb0-4645-8a09-8c6c466950a8/furekozevegorojenifi.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_off0000de82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 5508 bytes
SHA-256: 7cdb57358ba18cf30fb81ddff5d6cdb57f37cbbd240276320762708434c905ea
font_01_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 11400 bytes
SHA-256: a320add66844b7267b64b27022b79718ef386f8c01a66340bae87ba49457495a

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