Malicious PDF — malware analysis report

Static analysis result for SHA-256 43acb58b5b58b3a3…

MALICIOUS

PDF

80.6 KB Created: 2021-03-19 04:22:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: f995ea53720b7c4028c0ca15fff74b6d SHA-1: c3ed2117d989d7b23fb19ba5744f73498d5bce0d SHA-256: 43acb58b5b58b3a3c13af84b36536c385ea21b1fcca4dd4495fed9a2954a540e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation scheme. One of the primary URLs extracted is https://leonvi.ru/wix?keyword=eric+church+tour+2020+chicago, which appears to be a lure for search engine traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/wix?keyword=eric+church+tour+2020+chicago PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420902/normal_5fdc524b28ddd.pdfIn PDF document text
    • https://dojudetokin.weebly.com/uploads/1/3/4/6/134613144/larowasiwi.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/3125428.pdfIn PDF document text
    • https://datipozor.weebly.com/uploads/1/3/0/8/130813945/dufupawabetizo.pdfIn PDF document text
    • http://sibatike.getenjoyment.net/vuwunomomoxuxovuvokavani.pdfIn PDF document text
    • https://xiguvopumodajux.weebly.com/uploads/1/3/1/3/131381006/jazepogixu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468819/normal_60168e401448d.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/rokomumuvutuwopaf.pdfIn PDF document text
    • http://xepuxupipe.mywebcommunity.org/hp_probook_6560b_camera_drivers.pdfIn PDF document text
    • https://latezuletarok.weebly.com/uploads/1/3/5/2/135298634/3393031.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nokarox.rf.gd/counter_strike_1._6_online_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/project_business_case_template.pdfIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/11058738312.pdfIn PDF document text
    • http://tuguwobafadurot.rf.gd/70753274563.pdfIn PDF document text
    • http://penobugixova.atwebpages.com/biomedical_materials_roger_narayan.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/79812741337.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_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 5080 bytes
SHA-256: 571e45d47a6e2e16d247c61ced50ce2ab2bf9306f80b03728bad484e007e866a
font_01_sfnt_off000112e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E0 10220 bytes
SHA-256: d3e024ec7e2adc5cde046a34b0982f4bb7455ac297b6c302c54bea0732f6e4aa

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