Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9fb9fd19a25cba…

MALICIOUS

PDF

62.4 KB Created: 2020-11-24 21:13:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cae2ba900fef0f4b361308f9ba38ca1e SHA-1: 5fcd4f28c6b5056ce55bfd0c64aefc868d24c19e SHA-256: de9fb9fd19a25cbac144822a8f540863a6ad664a70276707722489f65bc3c365
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly indicate malicious intent. The presence of a link farm suggests an attempt to distribute malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/strik?utm_term=9+1+4+gallons+to+quarts In PDF document text
    • https://nexawukuvinu.weebly.com/uploads/1/3/4/5/134578226/denufabunele_walebuk_nebazi_piligewik.pdfIn PDF document text
    • https://depufavekozumel.weebly.com/uploads/1/3/4/0/134017714/8a295b1f5cbb1b.pdfIn PDF document text
    • https://fisuvinu.weebly.com/uploads/1/3/4/4/134497747/gowemizagepegoren.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452863/normal_5fa4963553d0d.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/bef2966a-5212-4acf-af28-191c3f078d99/wojexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49407b15-d2c0-4ee5-a910-6b6913848df2/bojozakafadesejeputajus.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/virginia_and_new_jersey_plans_compare_and_contrast.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/how_to_read_dexa_bone_densitometry_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad049175-5f1b-4e5e-9481-084abcdfb77c/nfs_u2_indir.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/tojuguwujepenibon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88959ded-6cd2-40c6-8d06-d75cd060f5ff/74894040378.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/victory_elementary_principal.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/vofudikozet.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_off0000b946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB946 5180 bytes
SHA-256: 3a85b65bf3f372545abca2f154c7d661d391eccde86f3fe252559d9dc0712368
font_01_sfnt_off0000cafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFB 10016 bytes
SHA-256: 7c427cb120b2fa99546cf32709d93d13317f806830bffb72ec6510106fb140f4

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