Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ced6cbb5e0861f2…

MALICIOUS

PDF

73.3 KB Created: 2021-02-23 00:11:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4871dd4a1914b73caf27efad9d738cd SHA-1: 7c471334f4d86ffb5f543d03258519d3ea13874d SHA-256: 9ced6cbb5e0861f2b134a42d16e36737f931ea2deb61f8560f24f61b68b1d6f9
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body is heavily obfuscated, but the presence of numerous external URIs indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=little+albert+experiment+short+summary
    • https://lipigilukezi.weebly.com/uploads/1/3/5/3/135347924/nugilixavej-dejugisuruna.pdf
    • http://abzac.me/my_airtel_tv_apk3xrpd.pdf
    • http://marketeuro.pro/technical_report_template_free63gc8.pdf
    • http://espaceabonne.com/himnario_adventista_powerpointmsgu6.pdf
    • https://dedidebu.weebly.com/uploads/1/3/2/7/132740692/78b950e.pdf
    • http://idealica-italy.site/vesudituwanaginabepuzujzir3b.pdf
    • http://differencecheats.net/watchmen_graphic_novel_summaryjnhxl.pdf
    • https://cdn.sqhk.co/widafopaj/yhfhdhe/juventus_vs_barcelona_today_match_live.pdf
    • http://gratoraama.website/28267062945mz5yu.pdf
    • https://fivosegexaf.weebly.com/uploads/1/3/2/6/132683078/vowufe_toxefexawedabix_kopixo.pdf
    • http://fishing-rods2.club/60910138703lsgt8.pdf
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/vamavunekusew-javenexevakawok-paridekikonido-fexiriwaxopa.pdf
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/5938687.pdf
    • https://boxoxezerutevok.weebly.com/uploads/1/3/4/3/134317212/kukapasalax-sezazapitula.pdf
    • http://thelandofbadideas.com/odia_song_2019_neweijp6.pdf
    • https://luzulobopado.weebly.com/uploads/1/3/2/6/132681737/215dbb367c09da7.pdf
    • http://trastenmyqort.online/rarajumo7awzx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jijumupade/nuletaz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e39d.bin
7054e86602be1bcc85bc230eb065758280a857c773a2db30152e70713c1179e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE39D 5312 bytes
font_01_sfnt_off0000f587.bin
c0d3e47374a2f609dddea516651f1d6915aa5de25b6a92e2816af4cb01958296		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 10076 bytes

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