Malicious PDF — malware analysis report

Static analysis result for SHA-256 66247a476f6f9922…

MALICIOUS

PDF

82.2 KB Created: 2021-05-15 02:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f6f2e5bc0e29905bc7620a1e4f6027a4 SHA-1: 702cf01d4d95a39ee4e20bc9575f77fd7638123f SHA-256: 66247a476f6f9922906cb29bb18d03fd5d209acc2c596785e6b96093538216e7
186 Risk Score

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 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://zajinet.ru/strik?utm_term=india+stock+market+today+holiday PDF link annotation
    • https://nasavizar.weebly.com/uploads/1/3/5/3/135322571/1439167.pdfIn PDF document text
    • https://funovupudejo.weebly.com/uploads/1/3/4/4/134473131/6823596.pdfIn PDF document text
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/remifar.pdfIn PDF document text
    • http://bimizuzi.sportsontheweb.net/ccat_test_answers.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/23392796013.pdfIn PDF document text
    • https://salovunuwav.weebly.com/uploads/1/3/0/9/130969923/moxivojuri.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/10130639270.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/basic_english_worksheets_ks3_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_865ba7b742e04cf995c3ae038f626fca.pdf?index=trueIn PDF document text
    • http://ruxujuzeto.rf.gd/55482832525.pdfIn PDF document text
    • http://vigamoburijom.rf.gd/gejep.pdfIn PDF document text
    • http://pezefaxovojole.atwebpages.com/83974669955.pdfIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_ba4fc42c47bc48ce9fbc224b546b67ef.pdf?index=trueIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_16c8a6c8720c4d1e82fe33f0c45cc3eb.pdf?index=trueIn PDF document text
    • http://lopesarej.rf.gd/96038388157.pdfIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_449dd32f5fad4475925274a1dea946d2.pdf?index=trueIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_5004fed3ebc449e2a33e96bfa1237ed8.pdf?index=trueIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_d93a2c14bebd4f038149498c3b4b1c29.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_e34e9e16fae44460bbb6877eb056a1b7.pdf?index=trueIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_e4229c6e852a4a3e9d64c506784f86ef.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_off0001031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 5284 bytes
SHA-256: 697968fab0513e9fd96a35db1812bb8ee123dc46667de49985bcf0d4088f5602
font_01_sfnt_off000114ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114ED 11364 bytes
SHA-256: 578b23857d44e1e0840cb640b3a2e1722e8f851ab1ca5876d1b8078df850ca47

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