Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7aaad8e9cffec14…

MALICIOUS

PDF

72.9 KB Created: 2021-09-24 16:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 558415b5e677fb6e6f930a945910dda9 SHA-1: 00e1765ef74c94e304f2468a862c63dca71beff9 SHA-256: b7aaad8e9cffec14639e8c994b87e78e39de7f0d47782f9b3f026c151662095d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://webinaris.training/ckfinder/userfiles/publics/files/99392016117.pdf In PDF document text
    • http://ancheng-medical.com/uploadfile/files/tobunolexuxozepam.pdfIn PDF document text
    • https://hiroyoung.com/data/files/76154169022.pdfIn PDF document text
    • http://poiskvod.ru/images/file/12690834078.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631419745_1.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d3bfa863e3ffc6f1e824ff66c301a619/goradevofadewuzitizup.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/2812956361.pdfIn PDF document text
    • https://activepymes.com/pub/file/23848571149.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/soxiwosuximigibizudulal.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4288620017.pdfIn PDF document text
    • http://anninh247.info/upload/files/jewitozirokeku.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/kovonisazomube.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/66852707080.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/tatuzaminu.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/65807946254.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/81317487433.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/84268295054.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/tegusog.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/jepotezaza.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/29487985506.pdfIn PDF document text
    • https://noventa.cz/media/files/file/naxavexevej.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/19547189740.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/69068780921.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/89909055930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hwang+jung+eum+we+got+marriedPDF 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_off0000b7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B2 17928 bytes
SHA-256: c665decfe1455c9e85b323198bac5267c2bee56680879277d5f552f478135cb3
font_01_sfnt_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 10684 bytes
SHA-256: 0e4c587d9bddb44f67d46786999b570e72fb25eedde0c8507b6ce2b44dd658cc
font_02_sfnt_off0000fe2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1