Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d7ce96dc670196…

MALICIOUS

PDF

68.1 KB Created: 2021-09-24 19:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4c682d2053031d433b9ae0ff4a134987 SHA-1: b2ac1560197d44d014acd7120531f4e46e19bcf7 SHA-256: 79d7ce96dc6701965223a15aa2355c0a7412639649a771f90f5d07ebcacaa23d
146 Risk Score

Malware Insights

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

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The 'PDF_IMAGE_LURE' heuristic indicates it's an image-only document with an action trigger, designed to trick users into clicking. Multiple external URIs were extracted, suggesting a link farm or redirection to malicious content.

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://progfin.pl/userfiles/file/kenawedonorulew.pdf In PDF document text
    • http://firmen-bekleidung.at/userfiles/file/92109243890.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/21207444400.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/pisatixewebigop.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/zojesuxabokina.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/16378651934.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/23830015644.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/32943980149.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/78737628830.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/37998950032.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/lilimimubakunarego.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133613106bb4---papilij.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/98172791108.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/53030280570.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/2486205262.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/04u4qvg8jtdkt3ihan8hfiggu5/36937226038.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/bodoxusekagaxi.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091413504480554.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/42621468939.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/wumigidufepidakivowepedev.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/zegolu.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/74910507965.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/92985159016.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/lixejir.pdfIn PDF document text
    • https://www.confirmedtour.com/files/geleregavawuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mod+apk+org+application+keyPDF 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_off0000aee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F7 10720 bytes
SHA-256: a5fa651394856df79c3588138a56d78428352588c3ae5b3bab320c6045ca9009
font_02_sfnt_off0000df7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7D 14580 bytes
SHA-256: 8f34a6c71fafcd4098fd73bb15baab283a18f9bd1ff2c35e93464360991b87d4