Malicious PDF — malware analysis report

Static analysis result for SHA-256 95df730386caae8f…

MALICIOUS

PDF

68.8 KB Created: 2021-09-12 23:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 041741b1339b9100854df0cd92f08e20 SHA-1: 492dbe813edf9c51fdc1e769fbe56a3dd1740bd6 SHA-256: 95df730386caae8f3eb51ab4d926235b634ce62c08ce82627fdd259b503ddb6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the link farm heuristic indicate a likely phishing or malware distribution vector.

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://crysiq.ru/uplcv?utm_term=io+game+list PDF link annotation
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/biwevedi.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-5/20210905115254866975.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/44241598485.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/49962043080.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363f31ea15f---fetakikatufar.pdfIn PDF document text
    • http://liluby.com/upload/file/17221540758.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/zesulajubilav.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/82502825130.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/59880583447.pdfIn PDF document text
    • http://videlec.be/ressource/file/51183860315.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/13339706138.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/78177659002.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/39859392847.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/vugomovovoxozapovojoni.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/kolokejodinegepotikuf.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161394f280634c---gokalabarumijaf.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/86952827002.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/62175565975.pdfIn PDF document text
    • http://millecolori.it/images/file/kosewakujudinesadulitax.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/98223732446.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/46748534191.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/9319998675.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/32862150822.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/28759758409.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/933522807.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_off0000b144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB144 14932 bytes
SHA-256: 1ea08dd2b7deacdb096266e57a21e8c677400f194d214e5d8cf25559f516a6fe
font_01_sfnt_off0000d701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD701 10200 bytes
SHA-256: 8bd8796ff5dce45eb335a08b252d9779bcdcc346da86e2bc412163baaed656ee
font_02_sfnt_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1