Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa2f65e871db7f6…

MALICIOUS

PDF

73.8 KB Created: 2021-09-19 12:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d05592ae1d0a71e1eae4168bd7227d3 SHA-1: 57fd928b7ce6b1ec0eeb909eddb770aa42eaddd5 SHA-256: baa2f65e871db7f6b179ae39c2d1679093976a7ded72f90d2426fa3c9075dbc9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as a first stage of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.sudoku-cool.com/ckfinder/userfiles/files/kasamulilovurepeg.pdf In PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/41477891721.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/pidesinuvikezexukawol.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614131cd9b9d9---xopajes.pdfIn PDF document text
    • http://e-district.org/userfiles/file/47966588290.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/kuxutekuponamibejepez.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/83511733200.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/pofojukagusotipinod.pdfIn PDF document text
    • https://atrax.hr/files/powezeforuxurogope.pdfIn PDF document text
    • http://moneymaker-gold.de/files/xunipabapiratubumofo.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/22091434741.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/81337965673.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/75526906021.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/19442996409.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/37141316190.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/rutufuxa.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/49239786167.pdfIn PDF document text
    • http://edituj.cz/res/file/bufepegikujer.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109140851365185.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-14/20210914114728665453.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/61260925493.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/wimuzipabiterupejubuf.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/54673156524.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/52487471479.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109020304258221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=harry+potter+prisoner+of+azkaban+free+moviePDF link annotation
    • 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_off0000b92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD141 10936 bytes
SHA-256: 6feaf3477752a2a7597fecdb943110c63bf9e3c9ca4cce290f0854cccb6127ec
font_02_sfnt_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 17928 bytes
SHA-256: d8ae64c06e043d2d378738456dd28dc1d074e7f6b9a93d6d7258b14534566781