Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4b30c8765ae353…

MALICIOUS

PDF

78.4 KB Created: 2021-06-01 15:40:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c875930129de7855117e6a793e57a14b SHA-1: 248eefd5370d8f4b726359dbfb6fa77520399a98 SHA-256: 0c4b30c8765ae353c3d1e7cfeb881625fbf515d892bfdd5706a635b92b0e1d45
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://crewmak.ru/pbw?utm_term=how+to+change+volume+on+adt+safewatch+pro+3000 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421613/normal_60134bbe6550b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373240/normal_5ff24f537beea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_603a865941ff7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_60543fb6047a3.pdfIn PDF document text
    • https://vekupaju.weebly.com/uploads/1/3/4/4/134479754/7804196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455194/normal_60438d7b327ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388040/normal_605f63189c1d5.pdfIn PDF document text
    • https://sepuvomaxobaba.weebly.com/uploads/1/3/5/3/135311468/sedimimek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488314/normal_604905945fbfe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374533/normal_6001877e4cd55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d73cdb80-62f2-4d82-b15d-4e7bcab9557d/frases_del_libro_el_poder_de_la_esposa_que_ora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34adec81-e769-450f-80c0-26c283569975/47672716010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa2a810b-3b3c-4b0a-a5fe-b1356d223c84/27504864687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42dcdb12-3458-43eb-8bd5-1b22ccf7d4ca/garmin_gps_78_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38bb8540-192c-4cca-ae1b-d46686471f4c/cardiologia_pediatrica_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a63c98c-5c98-4ed2-bc74-aee6a2ce65d0/que_es_ovogenesis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dff9d94-a6a2-406b-938f-ed838b3b01f6/class_12_ncert_biology_textbook_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 5820 bytes
SHA-256: ab9ec4e0b4ed12cf682c0bf49a9fbbad2fc9895266c6ecb231ae58dca6c178ca
font_01_sfnt_off0000f71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 11488 bytes
SHA-256: a60d9b4058e31f81b03c31da4c933415f00cdd12ce60a9ff4d9227e3317d98e5
font_02_sfnt_off00011e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E43 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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