Malicious PDF — malware analysis report

Static analysis result for SHA-256 41867d28105f154d…

MALICIOUS

PDF

75.1 KB Created: 2021-09-18 10:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 836cfc3c8b061d544128a6b1e9373a5d SHA-1: cdae6be439dfc8b10c5f8c867192f27463a98f3f SHA-256: 41867d28105f154dbba86469fae0571dce996266f2a6bcd723bc89fde06cba26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs, including one with a 'utm_term' parameter suggesting tracking, point towards a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting, designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pixomot.ru/uplcv?utm_term=love+gaspar+noe+full+movie+online+free PDF link annotation
    • http://vividconcept.in/userfiles/file/53008962249.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/wofalilopinede.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/16535309599.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/fivila.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/64008567159.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/doxetomurejafefadezifatix.pdfIn PDF document text
    • http://packturf.fr/files/terefelesirefagetazuvi.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/vopawefef.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/8311132591.pdfIn PDF document text
    • http://kaies.net/upfiles/file/fedevukigozutobobup.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/diribelovene.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/xevepilugowomusobozugari.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/pivuginafuxirelunigedew.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/91856841821.pdfIn PDF document text
    • http://df-2.de/images/daten/file/tifowakujufus.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/62076916295.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/wamagapijakopi.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/81087941188.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f902e38fcb---26203149165.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411cf66d6fa---mujizorexu.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/pifupawemadenepilovusosik.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/wazojujajejisefawoguk.pdfIn PDF document text
    • http://szwygs.com/upload/bufuwusez.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/bibasa.pdfIn PDF document text
    • http://hotechike.com/files/files/14436472249.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/8988406004.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_off0000be82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE82 18176 bytes
SHA-256: 787c69667fb37b793930c4e85d86f8ace1a078571cb516a4b2b0436f4d57e29e
font_01_sfnt_off0000eddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 10724 bytes
SHA-256: 5be0c7b136cf7a224bc5c42fc51eaba9b23ab24070baa6c68ee30a151bf93a20
font_02_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1