Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b8a01c570aac7a…

MALICIOUS

PDF

68.4 KB Created: 2021-04-19 07:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ed9dd51339ad93b33b6ba5d346078848 SHA-1: 3dae72b541fa0bd63378775c107c3bb77c84625e SHA-256: 09b8a01c570aac7ab157860c86cabc67f44862677f9731cc4896f08f91fdc1e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=hyperbole+and+irony+worksheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470960/normal_5fccdb75998c9.pdfIn PDF document text
    • https://zafapajesat.weebly.com/uploads/1/3/0/7/130740498/dewalisiremobe.pdfIn PDF document text
    • https://cdn.sqhk.co/jifibipex/i25ii5A/dabomotukilelogen.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/iigfojf/57886290791.pdfIn PDF document text
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/3204959.pdfIn PDF document text
    • https://rudotuvesil.weebly.com/uploads/1/3/5/3/135398110/donopotejeduna-runaluvubom.pdfIn PDF document text
    • https://xuxozuxar.weebly.com/uploads/1/3/5/3/135326767/novime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_6015190c4f919.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/chf3MlS/synonyms_for_diversification.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/informix_4gl_sample_code.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/nosufupojorale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a06cb927-aa27-49cd-814e-677593ee04ae/zaxupum.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/the_brief_bedford_reader_10th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f80c7b4-546b-4b72-9b35-ad9b8d3a047e/hp_laserjet_1100_driver_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/junidowomunad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c633bbc4-0f82-4f46-b0c5-0ee33b096584/nawijunet.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/lowrance_mark_4_chirp_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/what_do_amazon_operations_managers_do.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9E 5488 bytes
SHA-256: 97eee0253569553d64b0a4e0d4d1a940ea7b112b637ad7881ec2bc82c6c5ae76
font_01_sfnt_off0000e24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24D 10104 bytes
SHA-256: a49d95bac7aa373f961020a5a6a3ee0d379089b957c697f652cbcf8d7fc80891

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