Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ea526b7e18d926…

MALICIOUS

PDF

77.4 KB Created: 2021-09-17 22:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 71315148e132b38ca8a2980b10684d21 SHA-1: 06edae208adb6e33296eef77bed81558b3b885f1 SHA-256: e5ea526b7e18d92694c57f4f81aaaeab9f00e7f0374d3ead1cd9ea0f25a6e9eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to various domains, suggesting a link farm or redirection mechanism to distribute malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the PDF is designed to host a large number of links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://medvor.ru/uplcv?utm_term=google+play+download+android+apps PDF link annotation
    • https://kingcarmotorista.net/uploads/files/pobovitovatiz.pdfIn PDF document text
    • http://renknh.com/ckupload/files/30010615940.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/menozusujapinegapifup.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/99071421137.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/85459683860.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/67066012089.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/saredotam.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/juvagaxopiwexezozifibu.pdfIn PDF document text
    • http://sushibelovo.ru/files/retofuxejoja.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/jasifefijonozowegen.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/28193251609.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/pixagasozurowedikovowub.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/munuduvajuvekunut.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/vaputajiposulekes.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/wefoburulafekusisusawujaw.pdfIn PDF document text
    • http://indexone.ru/upload/file/kepiw.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/81146249149.pdfIn PDF document text
    • http://babamoleskine.com/files/file/tusarefotufolikosefa.pdfIn PDF document text
    • http://skncn.com/u/files/8378943346.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/lodejitogibo.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/tuzafolab.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/soxedonatiletatiwago.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/kaitu1bjr74k5dokq00l3m2l6v/taketemowupalotuwisosasa.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/dajejigotizonebulutabekok.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/fapejapaxukadezekotad.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/jipivitopoguga.pdfIn PDF document text
    • 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_off0000c89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 10708 bytes
SHA-256: a137fcc02d1faeda5fd5d60d8160a8f4b20ac555b7d27e7044115e07e71e3043
font_02_sfnt_off0000f948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF948 17900 bytes
SHA-256: b31fb7a8a9f1194c42c906c8876e6fe38a78c3404dbcbbcbf60006bd505602a4