Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a76b8edc1960dc…

MALICIOUS

PDF

89.4 KB Created: 2021-03-14 10:26:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e94ebe1ae0e99cdffd6bc63e3a009b3c SHA-1: 863d47f4a425efba15e3d84a77619ebf9120bb91 SHA-256: 33a76b8edc1960dc87d4b0f63b9ed02df93a94053166f96d3f1dacbcd72a1aa9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/award?keyword=artikel+tentang+bahaya+narkoba+pdf PDF link annotation
    • https://ligexuvuzi.weebly.com/uploads/1/3/0/8/130814340/lasinexubufu.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/fimepagokeduxuw_dimogizewa_tajewa.pdfIn PDF document text
    • https://lilugotowo.weebly.com/uploads/1/3/2/7/132711957/kugota-lawutiw-pisumejes.pdfIn PDF document text
    • https://cdn.sqhk.co/lewatesudo/fVgeQhc/codigo_procesal_civil_y_mercantil_guatemalteco.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/aigibE7/service_provider_definition_business.pdfIn PDF document text
    • https://pinonomobeberex.weebly.com/uploads/1/3/4/3/134318871/5924411.pdfIn PDF document text
    • https://cdn.sqhk.co/dojidavos/Wjijajg/contemporary_lobby_design_images.pdfIn PDF document text
    • https://poxosopetijonaj.weebly.com/uploads/1/3/1/4/131453527/xojul.pdfIn PDF document text
    • https://nexawukuvinu.weebly.com/uploads/1/3/4/5/134578226/vikasep-zunirepuxik.pdfIn PDF document text
    • https://xuwekakef.weebly.com/uploads/1/3/1/8/131856316/wupasudi.pdfIn PDF document text
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/tapuko_likeduxogo_subopunebutinu_xipafif.pdfIn PDF document text
    • https://cdn.sqhk.co/nakokixega/giihigx/nokugigabubobiv.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/0c100ed8-5512-4c73-9d0e-db6dfda60e22/yardman_riding_mower_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/defining_deviancy_down_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/25829438572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67745767-bf73-4212-8ea7-1e5eecd5efe7/kogewifavasemidem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa5178b4-39f0-4337-aa6d-cb9d2dd74443/96755646429.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/45333300893.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_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 5420 bytes
SHA-256: 04b8f7f4ce1756ba84fec8fb356147b4954cfb4f404638f403a16fd4ce5071ac
font_01_sfnt_off00013604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13604 9844 bytes
SHA-256: 5eefcbd909a7af5dc767d6e223f3cd6eff5598c4a7ea56d77dccf6bd45797096

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