Malicious PDF — malware analysis report

Static analysis result for SHA-256 acada740f34586aa…

MALICIOUS

PDF

81.3 KB Created: 2021-10-09 23:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 40ecc792fae9c2e0b18fdc7eb3a4b955 SHA-1: 9346aa8c5ad486829bb37fccea76125cd10b9764 SHA-256: acada740f34586aaa6e77887a0d79286b49d95c32f0c5c79b720781fc329eb7c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to other PDF files, suggesting a multi-stage distribution or phishing campaign. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, likely to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/raraxowanodoz.pdf In PDF document text
    • https://partnermind.cz/images/files/mufomudimabepok.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/ridejodevoxalom.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/lunodavatezomozevovuvu.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1554753726131f43d0129a.pdfIn PDF document text
    • http://tokado.ua/media/file/vosuripulij.pdfIn PDF document text
    • http://camonetinternational.com/files/file/23593136321.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/pemagiragejogena.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/namejuzoliruwekebo.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/19128499363.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/lutapofedexofizesi.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/bekibugugozopunobika.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a8cee207a3---lukofozigit.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/rudojapuxerepugisixogokil.pdfIn PDF document text
    • https://webmenuplus.com/images/file/60539544766.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/zazezukidivipesokiko.pdfIn PDF document text
    • http://medrea.ru/upload/files/remetapixemuze.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/pesirezenar.pdfIn PDF document text
    • http://studiodelcorso.eu/userfiles/files/22515566559.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/44876437496.pdfIn PDF document text
    • http://szpk.hu/_user/file/37156532506.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021091442833_1008089750.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/datejukibifitit.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/49560753691.pdfIn PDF document text
    • http://mobiliteit.nu/files/diziveli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=will+bring+aboutPDF 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_off0000d7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 19176 bytes
SHA-256: d96be90ba6aa1d7097f3ce92657e7eecb3c3c57d68e61b09b4eb19e220339eb3
font_01_sfnt_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F9 10216 bytes
SHA-256: e6eab40dcae7620ec74b34161554c4ff69335f90ddb678fa257ff17690e76c41

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