Malicious PDF — malware analysis report

Static analysis result for SHA-256 9771932c0889ad83…

MALICIOUS

PDF

59.1 KB Created: 2020-11-11 02:44:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f0f63c3b2eb9436815fae9fd4e6912c2 SHA-1: 1739e2ceb98f4f589063a727e5fa21c899194847 SHA-256: 9771932c0889ad83d8a05802448543c009d5e5b320499281cba6ab2f86ac8ae8
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. While no scripts were directly extracted, the presence of malicious links and the ML classifier's high confidence score strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffine.ru/strik?keyword=busn+11+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426423/normal_5fab1ce0aa47d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417817/normal_5f9e771e0609d.pdfIn PDF document text
    • https://rurevudo.weebly.com/uploads/1/3/4/2/134265418/wabege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388173/normal_5f9be6c1737de.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/gewisetug/ecri_institute_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cab366c-260a-4fd6-b3a0-49f4bb3d582d/jabokanekawoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc198b27-c600-47c6-9422-784446437d72/liriwedemipeleruze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35044c1e-fe34-4cf7-bc7f-0092aa035beb/nevijikazubidotavalelaru.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/beowulf_novel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/215dab91-ff46-42c2-af2c-bf6a3d9533ee/kel_tec_9mm_rifle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8474dbf-6b56-4d35-87fb-1dc049fcbaf0/19327889360.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_off0000aeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB6 4796 bytes
SHA-256: f5987b768ac5749f28b207142ee31630afa8f59b07dab8355918cba72ec52d96
font_01_sfnt_off0000bf2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2B 9616 bytes
SHA-256: 16f235c8a69032cb1c9514cf7be6383c36dadca531ac8dbe645b9f663def6bef

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