Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92c84e0e0611d12…

MALICIOUS

PDF

92.9 KB Created: 2021-03-15 09:07:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0ab809f1a61c4309edfbb223d98d85ef SHA-1: 22d9ada9d43cc942371250a0e7a82c888f05a8f9 SHA-256: f92c84e0e0611d12c69be96c49145c5129faf94397961ee3c95349f10af369a1
186 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 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/strik?utm_term=how+to+change+ribbon+on+sharp+el+1197p PDF link annotation
    • http://new-leggins.site/axial_yeti_jr_score_reviewv3dtk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489257/normal_5fcbdf0aa077a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484169/normal_60386edd51ea4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450641/normal_6025c4728379a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375507/normal_60444c7614ad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_600a4dc26aace.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374379/normal_604b5f881119d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417212/normal_5fdb555a4b253.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481993/normal_5fe44d02edf18.pdfIn PDF document text
    • http://callup.today/noxudujonesatekno4xi.pdfIn PDF document text
    • http://serviceforyou.site/69544220882ed9rn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466391/normal_5ff0cce3bbccd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_6d390d056a6b486881dc7efb49e3dbe6.pdf?index=trueIn PDF document text
    • https://05b56818-8b0b-4484-a411-4f1234233f1c.filesusr.com/ugd/e49726_4c75c05fb6474b71b60f3b74842759d7.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_794d1edd707841e7abdfde145deda2e7.pdf?index=trueIn PDF document text
    • https://712e085e-8422-4094-ae2e-709d430f1fc9.filesusr.com/ugd/bf8edb_6518c4a443064720be13865a25220ce4.pdf?index=trueIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_921db8f2ce5e4c82b607f9ebce2c238f.pdf?index=trueIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_7a5d81b811124c2aa6c51009c3c5e2de.pdf?index=trueIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_4486a5075b5d409e98de19c1fe95c71f.pdf?index=trueIn 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_off00012a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9E 5676 bytes
SHA-256: 483d66bd669fa8c2e79a92d669005932dc5c17537d5cc1e7de4a2d7451d6b86f
font_01_sfnt_off00013e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E09 13328 bytes
SHA-256: ec94143dc1a239e7f88f02348292ddcec18a50f00964a9edc9dc38d94fb8b365

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