Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c15ef7306dd9de4…

MALICIOUS

PDF

78.4 KB Created: 2021-03-19 08:34:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21e57b9c1dcd996e0941a14bab6c45cf SHA-1: 6ed815a451a2f3d706823f53e3cce19bba8d01a8 SHA-256: 5c15ef7306dd9de42930173f8882b72b236da3bd06325a78d3d433a7ffcf0d62
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One of the primary external URIs, 'https://gimoguvi.ru/award?keyword=word+break+not+working+in+pdf', suggests a lure to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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
  • 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://gimoguvi.ru/award?keyword=word+break+not+working+in+pdf
    • https://static.s123-cdn-static.com/uploads/4388046/normal_5ff2817e4842f.pdf
    • https://static.s123-cdn-static.com/uploads/4450426/normal_5fedc21596b7d.pdf
    • http://podjem2.club/jezegopapodexuzikujzyh.pdf
    • http://max-lifting.store/eve_moon_mining_guide_high_secx0lj0.pdf
    • https://wewiruvikaju.weebly.com/uploads/1/3/0/7/130775929/e42224.pdf
    • http://menformula.xyz/keto_diet_at_el_pollo_loco2dj14.pdf
    • http://komozazene.getenjoyment.net/gemoxazoziwopifokalawodag.pdf
    • http://tur8osale.site/12567795048snexq.pdf
    • http://sadovik.me/dovixutufagorabojatibubrileb.pdf
    • http://aycotoro6.xyz/sopidetogagagoiqms5.pdf
    • https://cdn-cms.f-static.net/uploads/4464527/normal_600d2adb763d1.pdf
    • http://wonder-ita.space/bissell_proheat_2x_revolution_pet_pro_carpet_cleaner_costco_price4p8j9.pdf
    • https://tujupanex.weebly.com/uploads/1/3/5/3/135333196/50ee91f575ce.pdf
    • https://static.s123-cdn-static.com/uploads/4445128/normal_5fcccb24d9ffc.pdf
    • http://giveaway2020.info/best_korean_light_novelctkkf.pdf
    • https://mumamelif.weebly.com/uploads/1/3/4/4/134464597/bobafabi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pujinit/dream_on_aerosmith_song_free.pdf
    • https://s3.amazonaws.com/tonisefoteka/62491021563.pdf
    • https://s3.amazonaws.com/tubukeganuji/36386927427.pdf
    • http://sabiwilurase.atwebpages.com/rofazonuxivipe.pdf
    • http://zonafikepejese.onlinewebshop.net/ballade_pour_adeline_easy.pdf
    • https://s3.amazonaws.com/rabewiruzitewa/diamond_aircraft_parts_manual.pdf
    • https://s3.amazonaws.com/mijumomub/moxuruzirikafumutamamiviw.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_off0000f70f.bin
95521de64360465f12ea3851d197d4bc9b804fec3e2d5ac2787bf3025333ef6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 5308 bytes
font_01_sfnt_off0001094e.bin
f68629c7a6ab9250de95459d54b986a4774c585b4ad563d90b6dad4ef490a5d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 10252 bytes

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