Malicious PDF — malware analysis report

Static analysis result for SHA-256 8973b921f5056ba7…

MALICIOUS

PDF

71.6 KB Created: 2020-11-20 07:43:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 42314e5c1b098c42adbecf0d7c2b0d71 SHA-1: 1d24444930b856bed179179471fb5854125c7942 SHA-256: 8973b921f5056ba7c0861bb4ab6ca71e25a7741895f6498ba9d4bb458b3e8a1c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely attempts to trick the user into installing malicious software by posing as a necessary browser update or extension. The presence of numerous external links, including one to 'trafficel.ru', suggests a phishing or link-farming attempt.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafficel.ru/123?utm_term=birmingham+theological+seminary+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460070/normal_5faaeff15cc9f.pdfIn PDF document text
    • https://kotugelofamoxu.weebly.com/uploads/1/3/4/4/134403640/bd047d.pdfIn PDF document text
    • https://dalowosa.weebly.com/uploads/1/3/4/3/134383453/tageje.pdfIn PDF document text
    • https://badikodaxalele.weebly.com/uploads/1/3/4/6/134698448/tivazarikujir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478133/normal_5fad90438e0ac.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/sagavifom_ratirapeman_pogifetaxu.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/bidurudilidujug/smartfind_express_norman_public_schools.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/glhj_lh_i.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a445311-e199-47fa-8af9-780337fb37d5/organic_chemistry_hornback.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/how_to_recycle_number_5_plastic.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/12888307008.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/22766698106.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_off0000d8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F1 5448 bytes
SHA-256: b61e19e052d5226b0aa7c1e8081bfd0a4964d8fad8650ec1d13b273c7e435988
font_01_sfnt_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 12264 bytes
SHA-256: dcd8f91f478125c8fdabc661d3404f84de13c1f516d4823e8c552ee196c8cd5f

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