Malicious PDF — malware analysis report

Static analysis result for SHA-256 8306ca7ceef461d1…

MALICIOUS

PDF

70.8 KB Created: 2021-01-09 07:21:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 36e6a969f9611a81d22bc46bb52642a5 SHA-1: 22b026cd2dd427417b075c4d494747650f5b75bc SHA-256: 8306ca7ceef461d176ed59f3f1f518c17af42a5eb381544bed7a000aaa15789c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure or link farms. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to Google Classroom organization, suggesting a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=google+classroom+stream+organization In PDF document text
    • https://cdn.sqhk.co/fetadupozo/jcjjhc3/we_ride_we_die_together_quotes.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/e1ib8I6/nudaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5f8ea57052220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_5fbba773551e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_5fd322cc621d7.pdfIn PDF document text
    • https://bapoxaluw.weebly.com/uploads/1/3/4/7/134717037/3af0492767d6.pdfIn PDF document text
    • https://zisokilusativ.weebly.com/uploads/1/3/2/3/132303079/powov.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/7016128.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/3619a1f8-c1fd-44e8-81ce-ec69de95a4a3/wuzukodup.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/audubon_field_guide_set.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/dawopavipukexadetodosuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/bluebook_citation_guide_20th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/integers_worksheets_7th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/medical_certificate_format_for_school_admission.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_off0000d9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CA 5200 bytes
SHA-256: 82ff7c67af8f769cad09b6e7b64a1755490e3070383c34562ad24c8d6dd982ca
font_01_sfnt_off0000eb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 10112 bytes
SHA-256: 7c0b1067c93c5c906cefd4f4de535b5813b4b9d799fa4ebfd4e8105c3ad42360

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