Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af9478c89f604c5…

MALICIOUS

PDF

68.5 KB Created: 2021-03-01 12:35:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0db2fa6f5e3044c7b7d652d48f104284 SHA-1: 13bcc44be48541bc701b31cfc9add07586265f4e SHA-256: 4af9478c89f604c5f071caa68c476d5b704d3b9bb2f13993711b808e9692216e
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://baarspo.ru/strik?utm_term=what+do+playing+cards+symbolize PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459785/normal_602c05c219a04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477400/normal_600e8dacb41b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368972/normal_5ff98ed6c412e.pdfIn PDF document text
    • https://befunopokoxa.weebly.com/uploads/1/3/5/3/135327779/xosuwituwukegeloda.pdfIn PDF document text
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/puluraworagugetiz.pdfIn PDF document text
    • http://hurricane1.space/divide_using_long_division_worksheet_algebra_2dp19f.pdfIn PDF document text
    • https://subilitukufune.weebly.com/uploads/1/3/4/6/134629352/f0fc5e41f7173a9.pdfIn PDF document text
    • https://xaxibilezulaf.weebly.com/uploads/1/3/4/0/134096047/gufoloruduzit.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/wunupalezozerud/50104999267.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/zegidef.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/39617918330.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/enzyme_action_testing_catalase_activity_6b_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/award_certificate_template_deped.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/loxewediri.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B6 5580 bytes
SHA-256: 02f60e3bbced75cabf97b1a9d78f6677d2fd8a8a6aa39a0ecbe7d214dce5fdd1
font_01_sfnt_off0000d693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD693 9492 bytes
SHA-256: bcdcad447ae6aac9e7ffe2adec6340b8c1739d0d9205d52617a5f93c28fcc093
font_02_sfnt_off0000f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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