Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefda1d5c3f5efe0…

MALICIOUS

PDF

76.5 KB Created: 2021-09-21 02:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 773087ee39bbc32897c68db838e56255 SHA-1: 9498592a460374f61dd0d93ab81483a097bf20d8 SHA-256: cefda1d5c3f5efe0fd2139dbd8cd8ebd10b2a349f06be95926f1c5a0239a1265
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=pendoo+t95+firmware+update PDF link annotation
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/89718995679.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae3756566---satufamevug.pdfIn PDF document text
    • https://clove7.com/userfiles/file/77555068043.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/27224844018.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/92242009438.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/51054161858.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/konowobuvekiwagal.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021917438536269.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/mofevogepodufubujebut.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/82778854404.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/zapemiwuvimojis.pdfIn PDF document text
    • https://energooptima.hu/upload/File/disolirunovig.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/sitekalabidukagi.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/xupexedovutijurowof.pdfIn PDF document text
    • https://austarpharma.com/upload/files/bosemejupovegodejaza.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/sasopezefatadalul.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/13318831118.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613efb5905170---33359033634.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/kidoferejarunotafu.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/pexosazufotixixatanobozej.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/nodajikivonutanawulogad.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/50380393827.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109142005066733.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_off0000c147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 10936 bytes
SHA-256: c90433e34cbc3c5ae823c40e07392bad7ca8b3c3607dc3ad2f0ec8a373602e0e
font_02_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 19124 bytes
SHA-256: 16b131bd6c6fdb2a6e1485c0a3395f7b2b13889cf853403bbc50528d1c3af815

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