Malicious PDF — malware analysis report

Static analysis result for SHA-256 adcd5abc2a6b1c76…

MALICIOUS

PDF

71.1 KB Created: 2021-04-05 01:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4a46b1eb6f594db1733dff4d53da61ff SHA-1: 5db786dc31babc31fc0c3eab17479d008d0d80d9 SHA-256: adcd5abc2a6b1c76a25dba4de1c22510245b8b964f3d47ebd6150890ae52b3ff
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 4

  • 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://baarspo.ru/strik?utm_term=common+core+state+standards+ela+grade+4 PDF link annotation
    • https://cdn.sqhk.co/dodirorip/ihib6ic/neparatejitor.pdfIn PDF document text
    • https://cdn.sqhk.co/lozukoxokir/ajgiegd/6241617934.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/kBRgchh/doomsday_clock_comic_review.pdfIn PDF document text
    • http://sallles.ru/46587776303kplxi.pdfIn PDF document text
    • http://detonic-official.website/chemistry_isotopes_worksheet_answer_keyizsol.pdfIn PDF document text
    • http://technodom11.com/33954194102rljfz.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/ihjhfih/73340777174.pdfIn PDF document text
    • http://vitetoka.scienceontheweb.net/business_english_vocabulary_in_use_advanced.pdfIn PDF document text
    • https://cdn.sqhk.co/zafilivopupu/iRyjjkp/aunt_birthday_images_free.pdfIn PDF document text
    • http://negedibomul.sportsontheweb.net/zeluf.pdfIn PDF document text
    • https://cdn.sqhk.co/kumipexa/ajhhfhg/965249898.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/YjayGib/22915604016.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/GkyhhMM/yellow_jacket_sting_cellulitis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sotidunuzijifu.epizy.com/vakirutunugubarovavezilew.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/tunisixutanupori.pdfIn PDF document text
    • http://ganiwozipowure.epizy.com/hi_point_45_carbine_disassembly.pdfIn PDF document text
    • http://varoniwarovez.rf.gd/81992854387.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/14422976509.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/best_artificer_feats_5e.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_off0000db57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 5252 bytes
SHA-256: cc2099d8b4a4d9f8fc68c85005c2b53e7dc51adc97add669e6840abd1b0f1c4f
font_01_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 9980 bytes
SHA-256: 849132f6f03bb84d320dd419c0bad23cb656b6f3b13cc30c75aa0ba8aa218cd1

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