Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd1f8992cf3aec2…

MALICIOUS

PDF

76.2 KB Created: 2021-03-01 08:13:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: afdf64688e1fefd3bc36012090dd02e8 SHA-1: a7404ecca906877066d6f5b6014a48ff00364fa1 SHA-256: 5cd1f8992cf3aec27001b12283261ab10ab744e0ddf13bea515f12042abae990
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to host or redirect to malicious content. The document body, though heavily obfuscated, contains text related to 'Wd my cloud os 5 windows 10 app', implying a lure to download software. The presence of external URIs and the overall structure strongly suggest this PDF is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/123?utm_term=wd+my+cloud+os+5+windows+10+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425229/normal_600a83a6c6a49.pdfIn PDF document text
    • https://lozibojugor.weebly.com/uploads/1/3/1/0/131069840/jujorutigu.pdfIn PDF document text
    • http://wavasesinile.22web.org/html5_register_form_template_free.pdfIn PDF document text
    • https://diwodineguxep.weebly.com/uploads/1/3/4/3/134305573/826104052350.pdfIn PDF document text
    • http://hookup682.site/simpsons_tapped_out_hack_android_20208qzky.pdfIn PDF document text
    • https://riwozetamozu.weebly.com/uploads/1/3/4/3/134331456/5228611.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373782/normal_6008970a962e8.pdfIn PDF document text
    • http://tramlaweq.online/pinatijelrd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408187/normal_5fddd09b27ff4.pdfIn PDF document text
    • https://vomalutexoj.weebly.com/uploads/1/3/1/8/131871655/rimuw.pdfIn PDF document text
    • https://puwawegolawibot.weebly.com/uploads/1/3/2/6/132682739/tikodemudi.pdfIn PDF document text
    • https://danawojigu.weebly.com/uploads/1/3/1/4/131407111/4354292.pdfIn PDF document text
    • http://jovedarike.iblogger.org/luvamebamuburusugitig.pdfIn PDF document text
    • http://dostafood.xyz/nufiwuvavosope3385t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuzufuwav.rf.gd/evaluation_sheet_for_dance_competition.pdfIn PDF document text
    • http://fetudat.epizy.com/prisoner_b_3087_genre.pdfIn PDF document text
    • http://fopugaxug.rf.gd/magudejaje.pdfIn PDF document text
    • http://febarufowit.epizy.com/21452594108.pdfIn PDF document text
    • http://kikujebi.epizy.com/rewuna.pdfIn PDF document text
    • http://dezoruxeg.epizy.com/darkness_rises_apk_ios.pdfIn PDF document text
    • http://kavunuses.epizy.com/cesarean_section_ppt.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_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 5648 bytes
SHA-256: 00b92d475ed719a66eb2aef3a2825b455262136df74694649316d481c681da22
font_01_sfnt_off000100b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 10208 bytes
SHA-256: ecfb46d2ad14ce21c463bcd7b256165aa2956e361230f41d853afe4a1cacd77e

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