Malicious PDF — malware analysis report

Static analysis result for SHA-256 a227fc822be172e5…

MALICIOUS

PDF

107.1 KB Created: 2021-05-28 16:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8308c8f18ab55975106b6824f42d3d02 SHA-1: 9ffaa1936cd5d42e95299ec25fb6c56aaae80419 SHA-256: a227fc822be172e58bd737f42369f1299a5ae679f255127eccd7db84e4d83157
156 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 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
  • 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://botokaw.ru/strik?utm_term=exercicios+de+regencia+nominal+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372967/normal_6023a89059721.pdfIn PDF document text
    • https://vejupurujiku.weebly.com/uploads/1/3/1/6/131606174/fuwonulunafazemigozu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382412/normal_5ff68f973a38b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482027/normal_603596e68c2bd.pdfIn PDF document text
    • https://zitifulopesere.weebly.com/uploads/1/3/4/7/134722705/refosolopi-sebul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370078/normal_5ffaa82c47b66.pdfIn PDF document text
    • https://didipovewefof.weebly.com/uploads/1/3/4/3/134306756/betiduripobe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408601/normal_5fd038ed5fd6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453908/normal_600f4095e36f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498834/normal_600eaff7e6217.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389606/normal_5fc6afd75df94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403414/normal_600107efd6df0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_602be308f00e6.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/0e74f275-3519-47bc-8681-f2aebc19b243/stand_mixer_cover_diy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd05c61a-a0b9-49f6-bf9c-4921e6fbe880/pepamonizejixijiposuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dd3e098-8c24-4d2f-916a-61f5420bf877/lowabojepiwapomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57eda010-afdb-437b-acf3-adb973122d45/sezobugemavewunojare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/264b8905-370c-46e0-b3c2-2a433494e571/hampton_bay_fan_model_ac-552.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65b97772-b680-4f5c-9832-21184e888dd9/quicken_printer_not_activated_error_code_30.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000161ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161AB 5500 bytes
SHA-256: 01bf50afdd94646d09fe5fbe355c79179ba0ae96d64e356869e5f9d76c17ee5b
font_01_sfnt_off0001745b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1745B 13720 bytes
SHA-256: e2997b1db61d0801b87d30668f017a869bf41d73fb942f429253a7e9330724b5

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