Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52119cc781df28c…

MALICIOUS

PDF

72.6 KB Created: 2021-02-13 05:12:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d352668c7e0f999eaa5f1a880e8ec787 SHA-1: 72b7e6c5df5ace5cdc44f220b087df0507454a0b SHA-256: c52119cc781df28c903e58b04e7b87f788a0a616d098dd179a18648073468437
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 Weebly-hosted PDFs with numeric slugs, indicative of a link farm or SEO manipulation scheme. ClamAV and ML classifiers flagged this as a phishing or malicious PDF. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to potentially malicious content or phishing sites.

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
  • 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://jacksth.ru/123?utm_term=administracion+de+operaciones+pdf+collier PDF link annotation
    • https://sorefumegevori.weebly.com/uploads/1/3/1/8/131871670/682bcf1978f7a1a.pdfIn PDF document text
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/ketipepezojuvu.pdfIn PDF document text
    • https://xirazaju.weebly.com/uploads/1/3/4/8/134859293/10c4e2.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/6334386.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/MgifAiT/nasufewiboj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419452/normal_60034eed0a2e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412899/normal_5ff4c3efbc1b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489732/normal_5fd384b58d678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470683/normal_60201c0f15a9f.pdfIn PDF document text
    • https://ruwatavefi.weebly.com/uploads/1/3/4/7/134704280/3326871.pdfIn PDF document text
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/1286505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403128/normal_601d9a2a61401.pdfIn PDF document text
    • https://wisolowiguwo.weebly.com/uploads/1/3/4/6/134630140/numuzo-japojipufika.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/defujo/95986065318.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/nccn_guidelines_metastatic_pancreatic_cancer.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/asp._net_web_forms_bootstrap_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/chilling_adventures_of_sabrina_salem_human_form.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_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 5288 bytes
SHA-256: 324c9966057837bdcfc28428698cb62c0b08e84f2abb62fcb661011f3ad3b801
font_01_sfnt_off0000eec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 11168 bytes
SHA-256: 49224d727a8a7ef96ac98e8a580c5655591cc08f2efa6226a75ab968f9fb1b84

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