Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f941045db61a8a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 14:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c99d16a32fe998c6539271c7b6b1f40 SHA-1: 64575399b09312abbc0858bf1e78f38c8a01a159 SHA-256: 99f941045db61a8a51df36e36ecc76b8d25986703c179e095962fa79d22865e8
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, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to distribute malicious content or conduct phishing attacks by directing users to a large number of external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://krisoc.ru/uplcv?utm_term=kindle+for+android+help PDF link annotation
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140c9fa07deb---55146094155.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109061551248322308x2ri5.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/subuvixunamebegawitejelab.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/donigotipomud.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/nafemoronugorori.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/53273742588.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/salutaviwifut.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/90391461266.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/zapov.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/temumidorilozokira.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210907030033.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/93466567716.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/68750561074.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/lowabekuso.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/tijesabojilijojaxene.pdfIn PDF document text
    • http://ruresept.ru/files/file/32348428333.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/difoj.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/47998442812.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d3bfa863e3ffc6f1e824ff66c301a619/goradevofadewuzitizup.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/duvikewevo.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/83233526796.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/28428265664.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/83360857342.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_off0000d308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 18032 bytes
SHA-256: 8faff1dda1146d4a1e3519b37b0cb0510dc26a3a428f6709d73a047240bfc89c
font_02_sfnt_off00011964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11964 10320 bytes
SHA-256: 0468b5026e870d6750896646f2d09e2537a0489b108355573e6bbb613cfa7a4a

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