Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba8f20e8c81a75e…

MALICIOUS

PDF

73.2 KB Created: 2021-03-03 23:10:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7eea9820000d490fe228c6d56e86e2c6 SHA-1: dbd66679306c36d51051a731a5dae4b7c0b4e71f SHA-256: dba8f20e8c81a75eae61204b68d85d14c6c53d3ce33192f17182b6b1b572812f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to other PDF files on disposable hosting services, indicative of a link farm. ClamAV and ML classifiers identified this as a phishing or malicious PDF. The primary function appears to be directing users to external resources, potentially for SEO manipulation or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://baarspo.ru/strik?utm_term=free+two+step+equation+worksheets+with+answers PDF link annotation
    • https://cdn.sqhk.co/pozigafo/jb0Fggc/zombie_shooter_mod_apk_download.pdfIn PDF document text
    • http://moitender.org/types_of_adjectiveslo3in.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/aNFMMy9/56561743442.pdfIn PDF document text
    • http://nakrutkavk.site/instagram_dark_mode_androidd11a3.pdfIn PDF document text
    • https://jurisosisirebak.weebly.com/uploads/1/3/6/0/136086550/a8d0730c8f5b92.pdfIn PDF document text
    • https://zedebofewel.weebly.com/uploads/1/3/4/5/134594015/30de3cf23ba6859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_601bbaa77bcea.pdfIn PDF document text
    • http://raicen.com/85185502873wuiq3.pdfIn PDF document text
    • https://kakejomoweva.weebly.com/uploads/1/3/4/6/134674311/jemavirujewa_lenifexurejuki.pdfIn PDF document text
    • https://povominuvuz.weebly.com/uploads/1/3/5/9/135961678/vunovitopi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392647/normal_5fd658618f8b1.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/Pja8hjp/rizodubimi.pdfIn PDF document text
    • https://lexeponin.weebly.com/uploads/1/3/1/8/131856664/ruvibaka.pdfIn PDF document text
    • http://paypallsecurity.com/zawopamosexibemilhvyxp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446497/normal_5ff139c05af93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488560/normal_5ff880dd9b3d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000de38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE38 5112 bytes
SHA-256: f5ffd08c1ae579e615466b2a6d76459ed7e5062fee6bd8127adf3c8f7ad4f349
font_01_sfnt_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 11088 bytes
SHA-256: 813d88b093d0475513a8c2a66c3399a2b8217e639bf7fa0bf0153326a0a528e3

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