Malicious PDF — malware analysis report

Static analysis result for SHA-256 679ad232d5fbea37…

MALICIOUS

PDF

73.8 KB Created: 2020-11-24 13:03:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d4357553edf6c57d5f4cd16e6c8abacc SHA-1: dca01d04af95a6569ee2c3e2526d5bbdf7caa076 SHA-256: 679ad232d5fbea3721f840fe09d60b41aea0b6106400a13bca8bdcc97917a69b
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 0.9997

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://traffking.ru/123?utm_term=best+apk+pc+emulator PDF link annotation
    • https://dumexegutotopu.weebly.com/uploads/1/3/4/3/134354144/645830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416802/normal_5fa0922088902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412413/normal_5fad9abe48450.pdfIn PDF document text
    • https://lokugejepotag.weebly.com/uploads/1/3/4/3/134318746/toruzog-sevulad-mevewoz-kupekinegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f8749843380d.pdfIn PDF document text
    • https://gorigopaf.weebly.com/uploads/1/3/4/3/134341526/wuzujoxifavabubop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_5f9f9ca589a7d.pdfIn PDF document text
    • https://tejebufu.weebly.com/uploads/1/3/4/3/134353082/8cbce1a0d9fc46.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/serogajugomiji/12439613198.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/gatunijakiz.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/abakan_2288_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/waiting_for_your_answer_synonym.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/33642043915.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/sapemad.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_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 4920 bytes
SHA-256: 6262d86082e1482cacfec1591127ce25d587c02151f2f9f5ef63e1f6d33d68b3
font_01_sfnt_off0000e8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 10308 bytes
SHA-256: c924152ada5e5e987081d9b4cc6cf9bb4d5e4af91f3dc5bc279f3658795d9118
font_02_sfnt_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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