Malicious PDF — malware analysis report

Static analysis result for SHA-256 813068dc0b0afe8b…

MALICIOUS

PDF

81.1 KB Created: 2021-02-16 06:30:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2555885ad25a029e40028c876df8d3c8 SHA-1: 1b159c2d306e5194d8d0515e43d422822ea20a5b SHA-256: 813068dc0b0afe8b4604b536e30fbd3bc986a3d5855982e16d3c5c53d7daa563
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 0.9997

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://jacksth.ru/wix?keyword=student+answer+key+module+4+pre+assessment PDF link annotation
    • https://solezoxi.weebly.com/uploads/1/3/4/6/134654925/zonomuxefagubu-pumapewudod.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/dfa0f4d14.pdfIn PDF document text
    • https://latesadujogoxov.weebly.com/uploads/1/3/1/6/131607544/136bc50fc546.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389568/normal_5fcc75fe3d8f9.pdfIn PDF document text
    • http://totalcreditcheck.info/ziwisozotuvadedefidodfith0.pdfIn PDF document text
    • https://dezirivudamowi.weebly.com/uploads/1/3/1/8/131856369/7016306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382793/normal_5fd1f48392fb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459939/normal_601ee5ecd2403.pdfIn PDF document text
    • https://josusijino.weebly.com/uploads/1/3/0/7/130739082/kujani.pdfIn PDF document text
    • https://sizomejuxitiz.weebly.com/uploads/1/3/4/7/134748976/tujubopotupoje.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/8jgeCjV/gebowupo.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/iitRsih/license_plate_lookup_california_dmv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386330/normal_601da0129590c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 5552 bytes
SHA-256: bfd7e93f0af89be73d2e9cd177e3430bdc0177bd84a3551df852402971aceb5a
font_01_sfnt_off00011302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11302 10672 bytes
SHA-256: a705d4e1bba0505fe5aad15152e583a7f59543b116fa9f530207e817912e2dab

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