Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd90eda13d96ad2…

MALICIOUS

PDF

85.3 KB Created: 2020-11-20 10:09:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: baac73c893905b02c73fc36a2a3256b1 SHA-1: df128167e5190ce0e2a2a0385dc90914c4b9118c SHA-256: 8bd90eda13d96ad277956a753b6d87ce6c86b2f06c1f0a8d8905e0c647d5a567
214 Risk Score

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 and routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=google+form+to+spreadsheet In PDF document text
    • https://zadelenipavuluv.weebly.com/uploads/1/3/4/5/134595340/logekoserox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408335/normal_5fa698f843210.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/minosako-foluvuleripubir.pdfIn PDF document text
    • https://nujamoxe.weebly.com/uploads/1/3/4/2/134234607/6003563.pdfIn PDF document text
    • https://vepenisa.weebly.com/uploads/1/3/4/3/134339982/1355583.pdfIn PDF document text
    • https://rebivawofud.weebly.com/uploads/1/3/4/3/134375894/vulazeromigiduta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417029/normal_5fa9da698a23c.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/toliwudalamem/98299824806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25beecbd-e03e-4d3f-933a-38419d4c11ab/balto_characters_names.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/types_of_welding_caps.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/libros_sobre_aprendizaje_cooperativo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9c4677-7288-46c3-8d28-3ba7097db197/unsubscribe_all_steam_workshop.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/jejolasatiz.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/employment_eligibility_verification_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/50157044338.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_off00010f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8E 5488 bytes
SHA-256: 930aef9b797887a34018798fabcb845558a5967b3657bdf2a73fcb0604d645e6
font_01_sfnt_off00012212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12212 11196 bytes
SHA-256: 04515071efa4e6e21ac645304767cd2332b257c28c54cd7094c723c24c4ef1dc