Malicious PDF — malware analysis report

Static analysis result for SHA-256 3206cc4215caf1d1…

MALICIOUS

PDF

74.8 KB Created: 2020-12-31 03:02:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 215c031e17d8c77a505f16f6f4c518b0 SHA-1: 8a4163e6944f3aade5e97946aa6925e1b0329378 SHA-256: 3206cc4215caf1d1c24924516d62f02601c58c106a076150e4ddd323332b8f61
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://trafffe.ru/123?utm_term=maximum+charge+on+capacitor+after+switch+is+closed+is PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5f920dbfc0dde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369935/normal_5fc09bb947487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_5f8ae6fb78e99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493602/normal_5fc1f9c3e63eb.pdfIn PDF document text
    • https://depoferi.weebly.com/uploads/1/3/4/4/134445349/0c82fca3db6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_5fd6a69166c9c.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/dowavelaxam/ss_bat_ki_full_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83516739-44a3-4b61-845b-676b2ee44320/parrot_jumping_sumo_review.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/kutasif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aa5ceb3-d21e-4ec3-8768-46a87494daf0/miwamepozupugopusud.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/antiasthmatic_drugs_classification.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/air_penny_4_performance_review.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_off0000e54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 5732 bytes
SHA-256: eb330cf7d6bc47556225bb5e4b4d448c5a9d64c11aa0e37422be314a582dd81c
font_01_sfnt_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 10924 bytes
SHA-256: 9fc8c27c34ba05e839af96f42269124a60824f111675c87dabd8dc0e492579d1

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