Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf3d720410e90c8…

MALICIOUS

PDF

81.9 KB Created: 2021-03-25 17:13:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3965a30af49b2d18d0e217f735f7ed28 SHA-1: 06445750fbbdd9d8823ee5d0bb09dda9225c1dde SHA-256: 9cf3d720410e90c8cd09ca847d0f0f1b341a2ff4068e1f10994a8114354ada8a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=how+to+change+the+time+on+an+armitron+pro+sport+watch PDF link annotation
    • https://fekadoripegat.weebly.com/uploads/1/3/4/5/134592683/5200704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404975/normal_605458ab05062.pdfIn PDF document text
    • https://tagojakiwuki.weebly.com/uploads/1/3/4/4/134444274/1512219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413966/normal_5fe6cd2fc8c14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463830/normal_6031abbd937f0.pdfIn PDF document text
    • http://bigakeka.iblogger.org/les_autodafeurs_tome_2.pdfIn PDF document text
    • http://godumos.22web.org/mobile_app_specification_document_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372983/normal_5fddde0155123.pdfIn PDF document text
    • https://wujuwali.weebly.com/uploads/1/3/5/3/135326068/4799881.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fevebapu.rf.gd/nunedunujotidedumeronapi.pdfIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_cbd600d53723442b830078263e83cad5.pdf?index=trueIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_b4254dce5f8d4d8abf3bc7fa3e2b0590.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e045f7e5-1523-41ab-ba96-74d41a3827ad/69989873109.pdfIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_9831c6e0d4bf490c95eb70cca4fc526e.pdf?index=trueIn PDF document text
    • http://pikiregofi.epizy.com/how_to_clean_glass_cooktop_with_baking_soda_and_vinegar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5060536-a981-4c2c-a164-10fb9609ba9f/36278129906.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_d564d25bf5e34624981c6c0efe825191.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b944522d-b133-44df-bf14-a3ed746318d5/22656083908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/554aaf65-17e2-443d-a3e1-a95740e6b22d/84154773544.pdfIn PDF document text
    • http://janalusexisowa.epizy.com/asian_platform_beds_solid_wood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9348e968-ab1d-44b7-bf10-1bc806c2cca9/39129485156.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_off0001026c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 5368 bytes
SHA-256: 9cab4dd635356f99a23edef197d3c71e90575e3fe1a002d3ac84812bf20fb589
font_01_sfnt_off00011498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11498 11028 bytes
SHA-256: 078602dd20c036faf9dbec5f8d6b4bc77f727bf17107bcce626f86754cd29067