Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b958d32661b75e8…

MALICIOUS

PDF

71.3 KB Created: 2021-04-05 21:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4b62bacc7cb2250d93c32e8c48f72384 SHA-1: 81ca57388930cdca7c599ca1e451206b21f08e25 SHA-256: 0b958d32661b75e8776a69e670fb08b5d0dc7472f77d2b30978581d6c32cabb6
156 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 0.9997

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
  • 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://crophysi.ru/strik?utm_term=letter+from+birmingham+jail+analyze+craft+and+structure+answer+key PDF link annotation
    • https://dudunubute.weebly.com/uploads/1/3/4/1/134132035/soworeroxonuja-kewuvoj.pdfIn PDF document text
    • https://jolesebadula.weebly.com/uploads/1/3/0/7/130740242/kexobaxomu.pdfIn PDF document text
    • http://tafakiduwav.scienceontheweb.net/alabanzas_cristianas_de_adoracion_viejitas_letras.pdfIn PDF document text
    • https://wefakibulebu.weebly.com/uploads/1/3/1/4/131408371/fovapilotisuru-sebow-ruginifewi-dinijudiso.pdfIn PDF document text
    • https://polerobozugewif.weebly.com/uploads/1/3/4/3/134344868/votesipox-petozesi.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/5749608634.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/pirofopafu/37264611609.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/cash_receipt_book_format_in_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c6ef311-1bd1-4a3e-ba1d-b25a051f23bf/28556538727.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/riwidodamuxenib.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/nursing_care_plan_for_depression.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/best_free_odometer_reading_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/faforotobuwuzufubifov.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/48950570477.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/mefepumududizugegebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41186a07-883c-4c42-8b01-5a5a4a5cec31/how_to_use_braun_thermometer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08fdf369-cd82-42e6-977c-3dfaa73d2bd9/95099287908.pdfIn PDF document text
    • http://nofolimuri.myartsonline.com/pdf_to_word_converter_software_freeware.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/zeloderiwikaveguxexes.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/42341710214.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_off0000d6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E6 5900 bytes
SHA-256: 553eb70ab371660b0c0e809e25996a5f1ad4f8ab556154fd399421928eec610c
font_01_sfnt_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 10664 bytes
SHA-256: 7d806f3e65ed91c0161d67a2469aef46afd8b0eadca8046915f54da9d5f9ebd1

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