Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c4eccc640fb28a…

MALICIOUS

PDF

69.7 KB Created: 2021-01-23 18:06:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e765d99741198fe1a6327164197bb1df SHA-1: 9ce8076ecbf8b96c09a9fd112c6efd764395493c SHA-256: 88c4eccc640fb28aaec5559a917795a644a4a8ea0a77cd731e1dd0ed3acbf54e
164 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing campaign, indicated by the presence of a large number of external links, many of which point to other PDF files. The ClamAV detection and ML classifier strongly suggest malicious intent. The heuristic 'PDF_SEO_LINK_FARM' specifically points to the creation of a link farm, likely to distribute malicious content or engage in SEO abuse for phishing purposes.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/aws?utm_term=b.+ed+date+sheet+crsu+2018 PDF link annotation
    • https://cdn.sqhk.co/zunesunatiri/ifomsgg/rocket_royale_game_apk_download.pdfIn PDF document text
    • https://puzelosepe.weebly.com/uploads/1/3/5/3/135317481/jugixaw.pdfIn PDF document text
    • https://tirasuvemesamu.weebly.com/uploads/1/3/4/6/134672388/6002098.pdfIn PDF document text
    • https://cdn.sqhk.co/joxomawezu/giaBjec/best_hashtags_generator_instagram.pdfIn PDF document text
    • https://cdn.sqhk.co/gazejuruni/phVihja/history_s_greatest_mysteries_show.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/eWhhcji/67818059273.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabumamuv/agchdji/islanders_goalie_varlamov.pdfIn PDF document text
    • https://xegokefizu.weebly.com/uploads/1/3/5/3/135323464/gakunoda_lowefa_mepegufesinuzoj_xenuzafaz.pdfIn PDF document text
    • https://cdn.sqhk.co/samigimas/7jKijHq/11581423871.pdfIn PDF document text
    • https://sumesomorap.weebly.com/uploads/1/3/0/7/130738681/rajalita-femeleverav-fejisefenireje.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/kShehak/doff_super_cat_and_dog_repellent.pdfIn PDF document text
    • https://site-1166068.mozfiles.com/files/1166068/bubebakadolinigirozokajo.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/4SKihLf/freeze_panes_excel_2010.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD442 5596 bytes
SHA-256: 430f48081cd3a7ca0a7cb892677be5fb9a40d8ae1702b3d55f03ee3d86880dec
font_01_sfnt_off0000e74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 10248 bytes
SHA-256: b90643959df95ca4232745205ea0ded2d6871a08220e5288e33dcb0f4807637d

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