Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb00a7d55f4dc891…

MALICIOUS

PDF

79.3 KB Created: 2021-04-20 06:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afd286717de3d353311941cc7d4e2f34 SHA-1: b9d26d9361284926cf2d74b18f1f78799473e14e SHA-256: cb00a7d55f4dc891136f7aed171935e5e7dceb0d2314b3a3f713b8b9148b70a0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=brinkmann+grill+smoker+attachment
    • https://devigejijakefu.weebly.com/uploads/1/3/2/7/132740662/mofoxalipise.pdf
    • https://dunopupusegujuz.weebly.com/uploads/1/3/4/3/134348927/tulizodewomimi.pdf
    • http://totaxusozavu.sportsontheweb.net/boule_de_suif_livre.pdf
    • https://buvonage.weebly.com/uploads/1/3/0/9/130969236/vazon.pdf
    • http://lovelid.xyz/68207408915dlo3r.pdf
    • http://mscgis.net/womutamagudotelidiberu2wpvu.pdf
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/vabusulisedibuzived.pdf
    • https://benodamefeju.weebly.com/uploads/1/3/5/3/135346815/jamiliruwojaren.pdf
    • http://kersita.fun/sujet_brevet_histoire_geo_2019wd20s.pdf
    • http://onlinekartiadesi.com/will_there_be_a_sixth_robert_langdon_bookmf8fu.pdf
    • http://workbykoder.xyz/zagoforophytr.pdf
    • https://kaxinobo.weebly.com/uploads/1/3/4/4/134479785/pofibedisowa_rajefoxas_potofabok_kemeferaz.pdf
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/22d59af200.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://megigezorozo.atwebpages.com/twilight_render_for_sketchup_2015_free_download.pdf
    • https://s3.amazonaws.com/widofafane/how_to_play_monopoly_deal_youtube.pdf
    • https://s3.amazonaws.com/vuliwisuwig/dark_souls_2_scholar_of_the_first_sin_keyboard_and_mouse_mod.pdf
    • https://s3.amazonaws.com/titugome/intellij_generate_javadoc_template.pdf
    • https://s3.amazonaws.com/viboxikuz/1080phd_movie_tamil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e2.bin
494fba3d24d3c68fcb864341a9c4e1e5984b7f0aad255507ca5c99f4942cea87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 5112 bytes
font_01_sfnt_off0000fb0a.bin
9aea815117d8a5def04965113e1ba1500edfa38cf7e4f007e0f06930fc938fe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 11328 bytes
font_02_sfnt_off00012191.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12191 4324 bytes

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