Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c69d83c8d54a2ad…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 13:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea772bc4025321086201ba9103139ab4 SHA-1: 92511b190cda9bba703653964eec192b05b3333c SHA-256: 3c69d83c8d54a2adf04fd6d3838368aa97c570e1763c22a8d7ce05f41b30ef09
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting it's designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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://crewmak.ru/uplcv?utm_term=police+scanner+app+for+android PDF link annotation
    • http://www.arborvitae.cz/ckfinder/userfiles/files/xefugovegijunokuzemebuwu.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/96594445475.pdfIn PDF document text
    • https://ms01bet.net/contents/files/tikudi.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/kivizowategezomelivolija.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/38807795790.pdfIn PDF document text
    • https://blokhol.com/upload/files/69519346850.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/mobojesunulotuw.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/85809200847.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/dasuruwabijigemowabofuv.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///72736044390.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/asr31d80q45q1hnb3n6n7a52d1/8684531600.pdfIn PDF document text
    • http://jonme.net/ckupload/files/9216389107.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/jevidefinarovi.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/20300238590.pdfIn PDF document text
    • https://ka-base.no/images_students/files/86845377831.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161300c1b33c06---6428097323.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/jivig.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/4403863031.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/rawewubifogubix.pdfIn PDF document text
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/doriwefewofobitazeteki.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/8654102620.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/xiworarizotomowexutabe.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 17152 bytes
SHA-256: d5ed767c63596ec9782f3cf8f8739d174135ff7ad444665d9334e4a806ecd42f
font_02_sfnt_off00011fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB4 10516 bytes
SHA-256: a82202d9e1acbb710dd1e2ade91faa167843ff722e08e441d63f0a18343fabae