Malicious PDF — malware analysis report

Static analysis result for SHA-256 97bd37ecfe294c8c…

MALICIOUS

PDF

62.7 KB Created: 2020-11-19 01:50:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f40be6beef2685b4707101e2cc3ff26 SHA-1: 1be6242ed7d1d5cb42c67d4b4957769d98355297 SHA-256: 97bd37ecfe294c8c152f8921827dbbb10d354d43ecce04374a080092aabbd5c9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a potential phishing or malicious site. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of links, suggesting a tactic to manipulate search engine results or distribute malware. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/123?utm_term=capital+cursive+g
    • https://cdn-cms.f-static.net/uploads/4390382/normal_5f9ff58b02879.pdf
    • https://cdn-cms.f-static.net/uploads/4372737/normal_5f88dcaca3428.pdf
    • https://pozewovuxawa.weebly.com/uploads/1/3/4/5/134592866/9523294.pdf
    • https://cdn-cms.f-static.net/uploads/4369494/normal_5f9f9d64c2e18.pdf
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/8016302.pdf
    • https://cdn-cms.f-static.net/uploads/4366319/normal_5f871318509f3.pdf
    • https://cdn-cms.f-static.net/uploads/4426690/normal_5f9c8b0d31fe6.pdf
    • https://cdn-cms.f-static.net/uploads/4412165/normal_5f93841369b5f.pdf
    • https://duxebiforup.weebly.com/uploads/1/3/4/0/134013009/fuvodiwaxopimav.pdf
    • https://cdn-cms.f-static.net/uploads/4482863/normal_5fab19d565c60.pdf
    • https://gonupedifi.weebly.com/uploads/1/3/4/5/134524362/pegizilu-xofokef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0fcfa2a2-30a9-4658-a4ab-f3b529ccef74/gavivufudunomowoxamudamak.pdf
    • https://uploads.strikinglycdn.com/files/c0f7e53f-024b-4251-9c7b-cf38c3b01950/no_bummer_summer_98_rock.pdf
    • https://s3.amazonaws.com/jiwisigetizoxif/vitutoxopu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba0c.bin
559dc0f5429263f771fd88deef253c1fda3bc655dc8d584069a94e0ca5829f12
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0C 5064 bytes
font_01_sfnt_off0000cb5a.bin
2ef946bb51207e1027c1125623b0dd70b596c156a41b6a51fb550bf5ccd5d2fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5A 10360 bytes