Malicious PDF — malware analysis report

Static analysis result for SHA-256 e14d5529fbf5e550…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 13:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 672f52d1f3a2893019f55c0b85bfbc95 SHA-1: c73e5fe85e8cac028e1eb492b258de1a3352f064 SHA-256: e14d5529fbf5e550f39015194853dd3e0c02a25d9d8eeeebf09f9beb02765cba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous distinct hosts, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while many are marked benign, point to a pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sisiviwuw.pdf In PDF document text
    • https://cet.sk/res/file/43162336112.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/diginamegolugibexiribarek.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/11638236685.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/tezarinope.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/5607595349.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/tamanisejuzavules.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1ea54a1e---1457101787.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/48918806392.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/32819566801.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/jupiwovinugifawobov.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/25201983009.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/70475005614.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/patojoximopuladox.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/35246633172.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/96310037869.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/tevexe.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/80199317435.pdfIn PDF document text
    • http://rcmo.ru/upload/files/romimomazemurepefajasibe.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/78676529032.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/nozezovejiriwedu.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/8108101682.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/zumekotuxuxurebarezug.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/6496915182.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/gavusejilogepapik.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/23088372154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ps2+iso+gamesPDF 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_off0000dfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 10224 bytes
SHA-256: d785f00f960491679a14e471f6a24d303fb670015fdd96a059b50a5da8531870
font_02_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 18328 bytes
SHA-256: 41ffaf23b2f0f185db57c0adcaadbc5132f7eda290d7cdc42f717df779a1f46e