Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7806d58dc62e2f…

MALICIOUS

PDF

63.5 KB Created: 2020-11-29 12:03:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: cdbebc627a1498457e4f51784588ea10 SHA-1: dc6404b13debf10393510637cfb16d76d6889720 SHA-256: 1b7806d58dc62e2f39e0796f34c16fccae2584d1dc27212a3bca4ca9b573bace
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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 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://trafffi.ru/strik?utm_term=mathletes+sample+problems PDF link annotation
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/gabemomigipenaguv.pdfIn PDF document text
    • https://tagunodakaveb.weebly.com/uploads/1/3/4/8/134865504/wafuxizexorid-pinemireg-jifofo-sesasus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5fabcebc3a4df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450354/normal_5fc202e7b2beb.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/f1b0e925174c3.pdfIn PDF document text
    • https://jefapijuwenumik.weebly.com/uploads/1/3/4/4/134435530/nixexasezidivo.pdfIn PDF document text
    • https://nutolifawivu.weebly.com/uploads/1/3/1/4/131437776/bivupetira.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a766260-0d9c-4266-a22a-a8d9942a38f5/zikoketewedofima.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/cen-tech_digital_multimeter_95652_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3714ebff-c886-4924-a895-5115ee49b8a3/81500668189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/440b7894-676b-4129-97fb-73e9cc8d5ab8/25371896345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e2937ca-55d9-4974-8ec7-8b5dd8be8d0c/63168483007.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/1445017920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28378f67-a8a8-4b3c-868f-2dd3624c8fd6/spring_break_gsu_2020.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_off0000bc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC68 5204 bytes
SHA-256: 5e6937f96ac922cd4a3060a90860d2877f0049fb79850f341ddc4c89bc80649a
font_01_sfnt_off0000cdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEA 9972 bytes
SHA-256: 1084a95aa18f7735452ffaca93c074c82b1b83d162478a5f8f7c412267b9c8ad

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