Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e30561c1701f68…

MALICIOUS

PDF

98.3 KB Created: 2021-09-20 01:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13667849972e37f93462afe87c39b566 SHA-1: 92907088882aad2e24eed4aaa3492ce6d736c720 SHA-256: d4e30561c1701f681412c3565cf3224cf4ff986b7cd8516ee5d8dfefa690189a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ijpdua.com/contents/files/jetitituxosibijilajajix.pdf In PDF document text
    • https://mobilaide.com/upload/editor/file/95770059818.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/14d4c65b2917b8c50da1ef628e04d7ae/nofivuw.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/lodefivenuwupumufoligixez.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091802033573499.pdfIn PDF document text
    • http://puisan.ru/uploads/file/53663687596.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/kojijosurimel.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/fezenisemopuvisolagev.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/92751917969.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/30439061833.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/31881020257.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/1468178121.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xusesi.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/68420037867.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/wejozufemevulejubodelemu.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/64090129029.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/47611940518.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5c6816a7e---tigilasilogezote.pdfIn PDF document text
    • http://skncn.com/u/files/kadebatuwijatadomadonox.pdfIn PDF document text
    • https://arerp.kr/data/file///lagomevufanuwaxiw.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/gexidiwupobivojediserux.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-15/20210915142414170097.pdfIn PDF document text
    • https://edusfera.pl/upload/file/xidodawenaliwejapago.pdfIn PDF document text
    • https://poker-fire.de/file/ribapakovidojakuk.pdfIn PDF document text
    • http://innotack.com/userfiles/files/39342779140.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/93827450528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mulan+full+movie+fmoviesPDF 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_off00011323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11323 10336 bytes
SHA-256: 580c8c9568bb322c1d0917748abfcdfd1269faf2fe52d768d1af94831a02870c
font_01_sfnt_off00012a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14283 22228 bytes
SHA-256: 3b1bc511d6641db17cc45d3b0314dc2dd08ef5fd384a512edc10392b5efcff12