Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5e7131dc84975f…

MALICIOUS

PDF

72.0 KB Created: 2021-02-13 08:56:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e7e93a450d85df403ca110d4777fdf90 SHA-1: 9b6660b6b6f4d44b2820dc235d9dde388d4d15d4 SHA-256: 1d5e7131dc84975f73e1eff695179c256291e3f5ef9253feb1a942c240aba090
226 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. It uses a password-protected-archive lure. 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 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://leonvi.ru/123?utm_term=dell+inspiron+6400+drivers+windows+7 PDF link annotation
    • https://duparumiwope.weebly.com/uploads/1/3/4/7/134707207/1009653.pdfIn PDF document text
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/a67a91d05d1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388163/normal_5fe1f89a69248.pdfIn PDF document text
    • https://xazegonegexedej.weebly.com/uploads/1/3/2/6/132683071/348b9e0e54.pdfIn PDF document text
    • http://uscovidcharts.com/gokagidubapifasoa2mcw.pdfIn PDF document text
    • http://autocredit.moscow/447119318515cd62.pdfIn PDF document text
    • https://felonuwonab.weebly.com/uploads/1/3/0/8/130814100/6506290.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486221/normal_5febdef7afc4f.pdfIn PDF document text
    • http://indital.fun/29558657344187is.pdfIn PDF document text
    • http://olymptrade.buzz/48843170975dy1vt.pdfIn PDF document text
    • https://mizevazorabij.weebly.com/uploads/1/3/5/3/135347525/21b92e88c.pdfIn PDF document text
    • https://lefafikof.weebly.com/uploads/1/3/0/9/130969708/388999.pdfIn PDF document text
    • http://ellmax-site.xyz/xumoravosidadeniwgm6j.pdfIn PDF document text
    • http://beamorem.com/yugioh_gx_duel_academy_codebreakerz78dn.pdfIn PDF document text
    • http://exemplpusj.com/17528385837ztmzi.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

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_off0000d997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 5356 bytes
SHA-256: 380ec55c2caa94674e182ff42b818025c2b0f617f2e37af4039fe7e7046e40a0
font_01_sfnt_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 11868 bytes
SHA-256: ea39ce6d741485702651e3d8e22cb337daaedc470e43dc117b5f7b9cff7c16a3

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