Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af5884f3857d36d…

MALICIOUS

PDF

70.0 KB Created: 2021-09-09 18:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e61b91d1f47758005fbf527f38ec3c8 SHA-1: 9feff9bfed6a997c7b6a0ccd73bf3a5ee50c4e22 SHA-256: 8af5884f3857d36d0cc85a114aed4171039f43ad16ea36c5e14f79f1d6d363f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The embedded URLs and the PDF structure suggest a link farm designed to redirect users to download sites, likely for malware distribution. While no scripts were explicitly extracted, the PDF's nature and the presence of numerous external links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://hotnews.md/upload/userfiles/files/11532494024.pdf In PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/najanuram.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210903101829.pdfIn PDF document text
    • http://leeandrewdavison.com/download/52482793303.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/navivelezubofasu.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/kejonimasokokobawafe.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/90798885204.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210908090310.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613985057fe7c---moruj.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/32656953577.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/revimiwuxemopiza.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/35052126180.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/rojepopujagesuta.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210904_23_50_9.pdfIn PDF document text
    • https://blokhol.com/upload/files/95625512315.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/gejivigamidabazeja.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/runokonutaviwiketoduvope.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0db9b813d1f115b863b1991b6271e763/bunujiz.pdfIn PDF document text
    • http://wych123.com/upload/files/54549575605.pdfIn PDF document text
    • http://twilaw.com/files/files/lafulujodetofetisusem.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/bisofulofizelelitujemus.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/95182537296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=golf+clash+apk+downloadPDF 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_off0000b376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8D 10512 bytes
SHA-256: f87e6ad5610d227c1a00f484a95c1b6b0ab4a5243d817e9c422b9af34e3676bb
font_02_sfnt_off0000e380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 15536 bytes
SHA-256: b66584ec0d7efe2d72e0672da376e7fa28ced64416349638d40718286f3cb65b

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