Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb9ab28626e0e70…

MALICIOUS

PDF

75.0 KB Created: 2021-04-04 10:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5318afdeeb70fcafa8ff67e9961fea9 SHA-1: d1b412681df9e6dbd974ccd668396fc7c2eff0d3 SHA-256: 6cb9ab28626e0e70baabba0187f7df32deff21f3fdc6f49944c231b8d0a97137
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=systemlink+4+code+list
    • https://cdn.sqhk.co/butituguxur/cojahgm/sony_a77_camera_manual.pdf
    • http://springital.fun/board_games_online_storejerw4.pdf
    • http://azakalaza3.xyz/the_bell_jar_summary_videoofjv8.pdf
    • http://skidki-day.site/tavurabusekek3bc33.pdf
    • https://cdn.sqhk.co/futogifoku/0gegiry/guess_60_movies_emoji_answers.pdf
    • https://kuwavumiwedow.weebly.com/uploads/1/3/4/6/134673312/wudenova.pdf
    • http://buyfastedcircle.xyz/23730514649wde8p.pdf
    • http://nutowokamo.iblogger.org/daxeven.pdf
    • https://sasozepawises.weebly.com/uploads/1/3/4/3/134315695/4614239.pdf
    • https://vixugusimuxomuj.weebly.com/uploads/1/3/0/9/130969476/2887271.pdf
    • https://sewimewomem.weebly.com/uploads/1/3/5/3/135323120/9194736.pdf
    • https://cdn.sqhk.co/nigigeje/s1Xigja/guboniz.pdf
    • https://sefokuto.weebly.com/uploads/1/3/0/7/130738721/1964483.pdf
    • https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/5310308.pdf
    • https://cdn.sqhk.co/ponesigis/pFfujaJ/zedge_free_ringtones_app.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_4ea8fcf5d274469786bde56270a31aac.pdf?index=true
    • http://xumerapugegivo.epizy.com/tv_box_app_apk.pdf
    • http://libogesozi.rf.gd/bivukozufan.pdf
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_01f37c6074e545c2bf7eebf037165c39.pdf?index=true
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_9c6b8d4248364bf3afb941b796fe0f8b.pdf?index=true
    • 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_off0000e911.bin
d0542057ac7dc6881b89164e4d68617909ec7e7f5e2cbed489ab3076607fc37f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 5136 bytes
font_01_sfnt_off0000fa8f.bin
57f93e8055727fc1657aca1a5d15c8812d002f568e7d93cc326aadd90f1c6fd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 10708 bytes

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