Malicious PDF — malware analysis report

Static analysis result for SHA-256 c043012e4a9269b4…

MALICIOUS

PDF

80.6 KB Created: 2021-01-11 01:11:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1b6f8fc8e5b5aa45b581e85e6c1baa9a SHA-1: c768ce083f892f26ec11dbb8c70ed4340e4e5be9 SHA-256: c043012e4a9269b4fceb3a20cbe746625f6cf09a3d6b841560eff3e3e8375216
214 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to redirector infrastructure and link farms designed to obscure the ultimate destination. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of multiple Weebly-hosted links strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

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
  • 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=construction+planning+and+scheduling+hinze+pdf+download In PDF document text
    • https://sazagirisama.weebly.com/uploads/1/3/4/5/134585928/7257055.pdfIn PDF document text
    • https://ropejanetim.weebly.com/uploads/1/3/4/6/134600341/deluvunato-dulavabinipowo.pdfIn PDF document text
    • https://patekakedosejot.weebly.com/uploads/1/3/4/4/134479085/7158210.pdfIn PDF document text
    • https://lekodapodigix.weebly.com/uploads/1/3/4/5/134500142/7004949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_5f87f622d6390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462726/normal_5fbca8d482dee.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/fejififimaketo/yakutat_alaska_fishing_guides.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/maryjean_wall_lexington_ky.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/aprender_ruso_basico.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/nato_vs_warsaw_pact.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/android_sdk_platform_28_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/solid_wood_platform_bed_frame_full.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/gavonakut.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_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 5464 bytes
SHA-256: f754e2a068930c790e6ee0381b4879c253a2489dd66c32009c2c5185182612ea
font_01_sfnt_off00010e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 11732 bytes
SHA-256: 525671f260cd12fefb16b93707f4c46b480abcd412bbb7f2eb89d8f863630399

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