Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03424188a4add80…

MALICIOUS

PDF

73.7 KB Created: 2021-09-27 20:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c84aeb37a0f434e87442fe76e654cb6 SHA-1: d71f5d574f7ee0ba26c4ae1cc3433c4c0d8fd96a SHA-256: f03424188a4add802f0d23ad59a5791267f6037a5865d0a37cddd818f1ca1499
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that point to a link farm, suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. No scripts were extracted, but the structure and URL distribution are indicative of a malicious PDF designed to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://purmoradiatoriai.lt/images/files/votesetosotofenipeba.pdf In PDF document text
    • http://sreema.org/FCKeditor/file/kizikuleraguna.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/33847049777.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109121850591544.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/50447729098.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/b2p0dh98ontoafm87pi1fdfbqr/73842189465.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/91506226485.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///12804774719.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/xoredizuro.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/lojojeb.pdfIn PDF document text
    • http://protezas.lt/i/File/logidafoxabiduda.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6146ab5bd9673.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/koxip.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/davalabu.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/pajoruw.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f26fee44d3---gubenisopoxajev.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/89495350098.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/diwodasuxesujana.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/48341721560.pdfIn PDF document text
    • http://fourfoods.com/images/files/40722251362.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zenipujoruseloserad.pdfIn PDF document text
    • http://servmed.net/userfiles/file/porisilenelixezixiwoxi.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/87081983476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=secret+lives+of+the+super+rich+full+episodes+freePDF link annotation
    • 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_off0000badf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADF 19488 bytes
SHA-256: 7eb74da8da9856f897ea1e9a679f7fb8c7d11162d34406ece1f10260069a3bfa
font_01_sfnt_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001063c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063C 10692 bytes
SHA-256: 5241354a4b5c1cd200f06257ad716b63a250fcac59d3c2c431257c9aa7d22006

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