Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a26e9eb7cd1e83…

MALICIOUS

PDF

85.0 KB Created: 2021-09-16 13:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3150ab6b4b540fe2af4a3bf3f2fdbc07 SHA-1: ada5f144d72f78b26a5f7ae986275df7cca3cfec SHA-256: d8a26e9eb7cd1e83b4261ceaed7433a3f03476b2fd6ba5761844ccf1ef122602
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the overall structure indicate an attempt to lure users to external resources, likely for malicious purposes such as credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://iieng.org/editor/ckfinder/userfiles/files/27362968668.pdf In PDF document text
    • https://qkon.ca/images/file/pekilugi.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/27038056.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/luveluv.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/xifudaguroweniginuresew.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/62014195961.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109070227351386.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b70ba02e34b4d793162721a2756e5e96/lorexav.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/vowazaxurowiza.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/titepovugibopukoriromajoj.pdfIn PDF document text
    • https://senegal4d.com/contents/files/73735296576.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/vunokepifamiwivizovoxelub.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/gurivutunasilad.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/bajus.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/26015446151.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/vuveruvijopuxixalaju.pdfIn PDF document text
    • http://ore-processing.ru/d/files/97849643417.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/84719893387.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/kukexoradaxamob.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f315968f3---visuwolebamexeredine.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109011218375247.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/mebatukeput.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613db0af3972c---kosavakekefopime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=android+app+files+directoryPDF 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_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 10708 bytes
SHA-256: 5e46583646705a5299578e051063ff6fb5892cade6d0d4a82d340a14dce3098e
font_01_sfnt_off000101a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 17276 bytes
SHA-256: 6511cb50773b0a6099cf4474a3754c634f2dea6479b2c2ea9111f53a76b6078e