Malicious PDF — malware analysis report

Static analysis result for SHA-256 2acfb1f4c8c88b59…

MALICIOUS

PDF

74.3 KB Created: 2021-03-15 07:48:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 59c8a2e529feec24a0f09225a7e20466 SHA-1: 23b4169715298febb31ea2610081c64e60cd630b SHA-256: 2acfb1f4c8c88b59d8184b98b5e69e6dae8e87e52c6c89d53342a0ee3438833a
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-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://gimoguvi.ru/wix?keyword=cities+skylines+best+maps PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465025/normal_601342d10d24b.pdfIn PDF document text
    • https://tupivoxutod.weebly.com/uploads/1/3/4/4/134467409/xibuwedag-fawej-lusefil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420431/normal_5fcb4778cc82d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419629/normal_602941762796b.pdfIn PDF document text
    • https://kevibudoja.weebly.com/uploads/1/3/0/8/130814666/poseban.pdfIn PDF document text
    • https://pagofere.weebly.com/uploads/1/3/1/3/131398194/1024892.pdfIn PDF document text
    • https://sipopupomiva.weebly.com/uploads/1/3/4/3/134307082/saruguvosalukesig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367286/normal_5ff68e03cc601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490369/normal_6009caa2d4c56.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/fbe5174d-5fde-4a93-a6bb-f874fc301c80/automobile_mechanics_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3837c36-b80d-4e4d-834a-d2368196bff8/how_do_you_pray_your_enemies_away.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_ec41af4e41b946e3b99c16c0b0866cd7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8a375a-1952-40be-b83f-16db23ca0865/87115155126.pdfIn PDF document text
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_98b5636344c74726ac19f6351479ad92.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29ff5803-7b71-41c2-ae21-909acbcb5d7c/94177455707.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_3e54e1571c204df7aaafe3d5f2529da5.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_fb9ae63b42ce4676a5124e8d1bcf3c87.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb23278-6d3b-4016-abef-da7ea1233b8d/bifonibojinikokutojuboj.pdfIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_2191b47a385d4cc8a7abcfa01917d94f.pdf?index=trueIn 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_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 5080 bytes
SHA-256: 7a340bf1d8c37910aa64471717cf8f056664c54232df0bab794faac117e96fe2
font_01_sfnt_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 10848 bytes
SHA-256: 570c122ba5c76b2a230498c6529cf9e1b9895c1fa91fdfe138225a538ae1cf3e

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