Malicious PDF — malware analysis report

Static analysis result for SHA-256 de745047466b3b1d…

MALICIOUS

PDF

77.5 KB Created: 2020-11-24 23:52:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9b6e34e1624ef3bac8e30693a656a042 SHA-1: 98c1493e1a86b50411b642993fcac464109cf505 SHA-256: de745047466b3b1d5c2f5cd86dbda6cdecc6cc4cb3bb4862b2d2eaf742118ebb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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. 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
  • 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.
  • 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://traffnew.ru/123?utm_term=contemporaneous+effect+lagged+effect+time+varying PDF link annotation
    • https://zuvimigiga.weebly.com/uploads/1/3/4/5/134586735/977549d05954b13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380226/normal_5f93515acd956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409606/normal_5f9a2b4bbcbad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393183/normal_5fac567a09b8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_5fa42b5853c5f.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/nawuvud/newabazulasalebonojuko.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/pitefibekajejozabonu.pdfIn PDF document text
    • https://s3.amazonaws.com/watoti/tiwixivewifez.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/call_ups_for_tracking_information.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/fiwutolemi.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/descriptive_quantitative_research_method.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/jazibotamoputoxefusabix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91c61405-30f1-4c5a-ad00-3e5b5a86ffd8/67019860299.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/nejutade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f5a71fe-6e6c-4399-a2f3-7fd0da460da2/21610623931.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_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 5540 bytes
SHA-256: c133086fabf7cd01805eb69d5659f074c7f39bd3da27a7e43a774ee3176abd41
font_01_sfnt_off00010328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 11016 bytes
SHA-256: 30b2643f4b092e5d231b3c2887eb297dbb0db5b2d8a372a63ae363169096fa18

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