Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f053998204e21f…

MALICIOUS

PDF

86.6 KB Created: 2021-09-16 01:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74dcd9056f8ad412016a8920d0d19974 SHA-1: 9c7ea1c50082297a5e0466520a1a98d09dbf4b76 SHA-256: 21f053998204e21f8682a39000db908da7100332ddfddb47af5569fbf1e9a620
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 or trojan variant. It contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=open+world+rpg+android
    • http://kooijobs.in/ckfinder/userfiles/files/mojivedugimemibesamaruto.pdf
    • https://www.tristar-technology.com/ckfinder/userfiles/files/75911558536.pdf
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/15284585902.pdf
    • http://handsonmontessoripk.com/userfiles/files/lozozaledapizopumoniduki.pdf
    • https://ocw.tw/uploads/files/luzexafomujesenozima.pdf
    • http://beijingteye.com/upload/files/segomasa.pdf
    • http://cathugo.de/res/wysiwyg/file/nederomexafakarutigonupi.pdf
    • http://datcat.vn/2018/file/barunotuvexof.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/fca4dfca278cef0cec118d916fe0c39a/mexapapixowatevugeza.pdf
    • http://bartuceviri.com/userfiles/file/sotubotugegajoru.pdf
    • http://getsolarnj.com/userfiles/file/55122902499.pdf
    • https://aaaxxion.info/images/file/47634032386.pdf
    • http://tano-cable.com/d/files/31643604458.pdf
    • http://boschvietnam.com/files/usersfiles/files/77781737080.pdf
    • http://weingut-suppan.at/files/41324729357.pdf
    • http://dogoxuavanay.vn/uploads/files/70387237697.pdf
    • http://urotunisia.com/uploads/FCK_files/file/bofesajofibodugepet.pdf
    • http://ceomit.com/fckupload/file/siguliwasas.pdf
    • http://uforoi.com/app/webroot/uploads/files/52577532687.pdf
    • http://richardchong.com/userfiles/files/70999492026.pdf
    • http://www.companyforte.com/imagenes/editor/file/fulawadirojo.pdf
    • https://consurs.ro/ckfinder/userfiles/files/88861804365.pdf
    • http://woodbridgeabw.com/uploads/files/77817949111.pdf
    • https://granitabrasive.hu/editor_up/62352610975.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16132c83bacd98---tarujadogujekenu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee97.bin
ab7a9618ab56a856770e234ec3b8ea3d4c505f4342557f76120bff55b7dadbeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 10412 bytes
font_01_sfnt_off00010611.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 16792 bytes
font_02_sfnt_off00011e23.bin
c7e40f5ce84560afe3fb42aab4bf4c57632f7cd70bdc8d1f0fb4c398f159635f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E23 18192 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.