Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b95c8bbd70f81f…

MALICIOUS

PDF

67.2 KB Created: 2021-02-18 03:27:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 53d1882926385ef583071c60594abdb0 SHA-1: 6423af31df5645a90ed26d541bf23471a6957f3d SHA-256: 64b95c8bbd70f81f00b97f79008d9c833876f2d2ef752c892a66f900adcaa287
196 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/wix?keyword=law+of+definite+and+multiple+proportions+worksheet PDF link annotation
    • https://cdn.sqhk.co/wojidumezu/ge9ibYE/11634165111.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/W91gjja/easy_wood_burning_art_ideas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473049/normal_5fd21972ce00c.pdfIn PDF document text
    • https://cdn.sqhk.co/ragekasa/qKhjmDN/porotaxetinopebetarogi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476930/normal_5fcaac805ebb1.pdfIn PDF document text
    • https://faneboluti.weebly.com/uploads/1/3/4/4/134464249/kazogimagibap_vawegudititu_goxifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_6025ab6bb803c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481836/normal_6017621bdc931.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468537/normal_6001f5f9bed65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453329/normal_601e2c3315399.pdfIn PDF document text
    • https://cdn.sqhk.co/bogabixexuja/igtW7hj/72025399664.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496389/normal_5fefd8439a68f.pdfIn PDF document text
    • https://zulijijala.weebly.com/uploads/1/3/0/7/130740393/vexiw.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://s3.amazonaws.com/fejatepudopito/25605286200.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_off0000bdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB6 5260 bytes
SHA-256: e909a71cc3c826c11b2283b43e6342f1f08861ddca1cfd756a1c7d55f00e85af
font_01_sfnt_off0000cf7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7A 10012 bytes
SHA-256: a55ec3bfd6b965cf669cd53dc7ff7b20beea4020ce38ced52074cec0f2759e73
font_02_sfnt_off0000f1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3