Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6298c1652f1464…

MALICIOUS

PDF

84.8 KB Created: 2020-11-13 08:16:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 515452f19881e78668f439b8d8f0f947 SHA-1: d9e51605f70a59cac17e6c1396dd82cca460bbbf SHA-256: 5b6298c1652f1464fb11b0f31afa98ed05792732a51404a9319b4f462f1bf5ab
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install 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 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafftec.ru/aws?utm_term=opera+browser+android+4.+1 PDF link annotation
    • https://nupirunu.weebly.com/uploads/1/3/4/2/134265900/nogekobuloz.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/fuxurepuneso_degufub_gerakujuvox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_5f95d16e6d4fd.pdfIn PDF document text
    • https://sanizazifu.weebly.com/uploads/1/3/4/5/134599836/senapi.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/d0bf886a5.pdfIn PDF document text
    • https://kowabimope.weebly.com/uploads/1/3/4/3/134359524/1122486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_5f88f327b5b96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427268/normal_5f9ab02b119c6.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/dorobukasawituw/67013612828.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/academie_sainte_anne_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/tesikumolatazofajo.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/xobupegepuvovidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/481c91a3-f0b7-479e-bdfa-ef4caf074380/24160236405.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_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 5060 bytes
SHA-256: f561aa55f692e8ba29aa8dc91b6414063d60f7aaffcc989f43b861030d9adac2
font_01_sfnt_off00011165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11165 11484 bytes
SHA-256: 2c3f97a24dab61b30eb350c3023da7c8dcc7c17602b1ee464180aba9f9784c14
font_02_sfnt_off00013846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13846 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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