Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16ab74a27aa4a38…

MALICIOUS

PDF

70.6 KB Created: 2020-11-20 09:06:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 22c541a8727658ba0c632185b4b846b2 SHA-1: d81d0e8647076d4e1354ca460f9377832a7e5e4d SHA-256: b16ab74a27aa4a3826107f9e206a7127c96298a3d78696189daf3c4f10af2298
214 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 and routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=aachen+tourist+information+english In PDF document text
    • https://cdn-cms.f-static.net/uploads/4421339/normal_5f96f8ebda49a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_5fa3a14755223.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/pumupipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417429/normal_5f98c63db9b94.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/fatisake/sububawevofam.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/17005115890.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/power_bi_report_server_drill_through.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/about_meditation.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/30_day_ketogenic_diet_plan_free_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca5f1f36-8345-421b-bf85-8ae4ecb7f24b/31757071311.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/tezanelinefedetoselakesu.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/html_css_to_nodejs.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 4

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_off0000ca1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1E 5168 bytes
SHA-256: a45be222da424f7844c263212ce38973f41d98b795b175b9567762525dbd3e7b
font_01_sfnt_off0000db78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB78 10840 bytes
SHA-256: 04f4645b628d5d571804debac3d15e288337af2299a529158ebbd1ca88c85b72
font_02_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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