Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42f0af1a9115804…

MALICIOUS

PDF

69.9 KB Created: 2021-01-01 07:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f3cf2905d71bc197f56c8518ffb83339 SHA-1: d385085b60489e78b55bc31f4ec164056d96cd2c SHA-256: c42f0af1a911580407080b7e449db7efa52b1513a62696d5c61772b62c821a51
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with a critical heuristic firing for redirector infrastructure. One of the primary links points to a known malicious redirector, suggesting the document is designed to lead users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/strik?utm_term=replace+3ds+xl+screen In PDF document text
    • https://vadukoku.weebly.com/uploads/1/3/4/7/134707593/kividilivitolobezawu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371807/normal_5f8e024160fa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5fa4326d5210a.pdfIn PDF document text
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/6891120.pdfIn PDF document text
    • https://sufudavinor.weebly.com/uploads/1/3/1/3/131381021/ziwudutevimawas-buvobigejazot-tisabo-litegakaku.pdfIn PDF document text
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/nozafosuwurudisuv.pdfIn PDF document text
    • https://tuvekowemenizog.weebly.com/uploads/1/3/4/3/134350361/7471158.pdfIn PDF document text
    • https://nifubadipapa.weebly.com/uploads/1/3/4/3/134388301/gotatafopetaveru.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/xalexojaxipud/77238212747.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/74985388359.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/coca_cola_amatil_nz_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/most_important_synonyms_and_antonyms_for_ssc_cgl.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/ac_delco_spark_plug_gap_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/cambios_de_temperatura.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_off0000d4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FA 5304 bytes
SHA-256: c6a5000e8e056b7b099d9edc76d7d912d122b3be5c5e368148b43172048b8dfa
font_01_sfnt_off0000e71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71B 10552 bytes
SHA-256: 6e4a5936a940ea7ee3b627d4d34438bca2f35c8a888f6c93edb69321b4810292

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