Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52b58b8cf5f14a2…

MALICIOUS

PDF

74.9 KB Created: 2021-09-23 15:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: aed6c9f573209e2c07c40f638cdf7284 SHA-1: a06e9ce7c4e9024f55ccb54d7f9571beef478be0 SHA-256: c52b58b8cf5f14a2f2a1dbef2fd9ba6a86672c5eef0a596f3ed05b6098f9e5c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file 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 designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high likelihood of this document being used for phishing or malware distribution by directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=windows+movie+maker+202 PDF link annotation
    • http://thetestmag.com/userfiles/files/tejepulokoxo.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/65845516481.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/baf20e0756d362dd56906862e2c4e53a/26656608670.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/buxemakavewugivexab.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/julijijelusidejijunawaw.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/puxalazinexelesagib.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161470dba880c0---53656468735.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/41418173330.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/vavozosofipefira.pdfIn PDF document text
    • https://exhibitproplus.net/mentorfinancial/page_images/file/rosinadokasa.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/zujus.pdfIn PDF document text
    • https://tele-video.ru/upload/files/ravumofidum.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/27419795214.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/samujejejojomepodar.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/48370154759.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210903223015.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/sudejivara.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/xomifameru.pdfIn PDF document text
    • http://zgic.ru/!upload/files/40198360266.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/velez.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/wikamov.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/62497556800.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/wapetudalowesiwaveguzefal.pdfIn PDF document text
    • http://web5gstore.com/Files/files/61721276199.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/kukid.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_off0000c300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB12 16452 bytes
SHA-256: 4401568fc5a94d795929b689691492acfe1de0cb6a73600ee7fac0fc9ed97e6e
font_02_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 10744 bytes
SHA-256: 91856360e3752a44d5651cc2f37d222b06955d867f93c2318f4c57acd0d9f99f