Malicious PDF — malware analysis report

Static analysis result for SHA-256 225d33b88ec0a65c…

MALICIOUS

PDF

90.2 KB Created: 2021-09-17 12:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a8f24b1f4c166ee71408757d472467c2 SHA-1: e40fd86cd6d8a7e62dc737e826857276c8578dc2 SHA-256: 225d33b88ec0a65cf5733fc74deede4ae48cffe81912fb595378a71d5848e09b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=format+to+send+resume+by+email PDF link annotation
    • http://ajisushionline.com/uploads/files/75017531419.pdfIn PDF document text
    • https://lesura.net/userfiles/file/potebunozoviwix.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/zamafetowumix.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f786dabc0c---pupisutigemumop.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/26461743599.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/19811876210.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/98212587585.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/datinilusatigatebi.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/13738193937.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/15596754978.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/widiporibixawagelup.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/22412511038.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/xojiwajeji.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/23497168952.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/28293868620.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210901170556.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/45339318173.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/dubexafefabesisaverir.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/rijibofavav.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/avelen.pdfIn PDF document text
    • http://studiodelcorso.eu/userfiles/files/madurivudomoxaxaketas.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/2288865508.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/xusuzaz.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/mewomutevevomode.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/60084955761.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_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EC 10740 bytes
SHA-256: 17d8fd3084ecb88b0243c628dc11233a4bef7ff466cc0dfac167d76a16f2bd35
font_02_sfnt_off00012b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B90 18420 bytes
SHA-256: 07927a240b5d84fe3589674891642517c5c1b1f175bacf647f6dd3b94094acf6