Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4683e5e0eb18a70…

MALICIOUS

PDF

66.4 KB Created: 2020-11-20 07:22:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1dd748c9db7ad29d71e73978366a0cc8 SHA-1: da937c7ef9fecb060151d0d01f098eb3be458536 SHA-256: c4683e5e0eb18a70703e029011713ad744195933b9b21fe1c1f9316634a5c87f
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/strik?utm_term=kali+linux+revealed+book PDF link annotation
    • https://pitimonajavigo.weebly.com/uploads/1/3/1/3/131383860/xufuxunawizidu-pefuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_5f93028cdbf31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369928/normal_5f990f8484c90.pdfIn PDF document text
    • https://sanivuledaxefe.weebly.com/uploads/1/3/4/2/134234591/xejunagaji_vobaser_tapasifabora_mojazurofovusi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454287/normal_5faf4b7a00f01.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/xupuwema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f87895ee1d40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403938/normal_5f9478ddb455c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f887bcb5a9dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d038ca4-b313-4cad-a214-9491c6578b5b/mixcraft_8_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eded67b4-fc10-429b-995b-c9322d705db0/zenawisigenugilakixinujip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/514d5380-512a-47e0-8100-5d233bd5c899/90053817816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db8ce471-b7e8-4f73-97a0-639ed1c6dae3/57875732301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b89925-530a-47aa-b399-5f4be950b95d/24270259197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d83316a-0505-4944-a924-f6b56921c6c3/refuzifej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c4ce740-946d-41f7-b4f2-33812aff138c/bewadesojugosalibogov.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC828 4944 bytes
SHA-256: 6e19a9f16734385ab7b13820373bf1dcd2e7771dd6313e79b7983668b3bb6a44
font_01_sfnt_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 10520 bytes
SHA-256: d4e909bf1d7c844c873171c2c62db459ffe1a77096d3524bfff946487ac744a2

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