Malicious PDF — malware analysis report

Static analysis result for SHA-256 8045376f9712a8cd…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 08:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c6dae855fe24463c93d7ac8c8f84f8ac SHA-1: 6f4c8a5e46c465c1fd867f26e9850a6df9dbf104 SHA-256: 8045376f9712a8cdfe0383e07d637e9cf4c8089958d434d239bdc241c3f0473d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic identifies it as a link farm. The presence of embedded URLs and the link farm heuristic suggest an attempt to redirect users to malicious content or for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://design-klasse.de/ckfinder/userfiles/files/koxuf.pdf In PDF document text
    • http://patronusalapitvany.hu/public_html/upload/momodajaketitalupusileju.pdfIn PDF document text
    • http://chipgene.com/image/files/20210917_065712.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/ponamexufeno.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/42499321308.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/47661434721.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a94aebc2463718c7db6daaabf471ee2/92186649001.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/68983055674.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/kezidirirasukadasilud.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///kifizowarurekepu.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/teterovoliwivisikaxoro.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/1757992922.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/pumukekeroritikelatiwege.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/76869824003.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/viwijunefaguwel.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/pererugamojuvero.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/menivulemiladeno.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/84592045754.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b1ee008319466089c65fdcc5a2508ca0/gutira.pdfIn PDF document text
    • http://12shio5.com/contents/files/93849586328.pdfIn PDF document text
    • http://ukrfirework.com/images/file/luvelewixi.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/88551456175.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/46889991072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sacred+games+book+pdfPDF link annotation
    • 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_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 10932 bytes
SHA-256: 974ff3b091e2c62db1baff3f281489b69265c2bedfe183fc89be3ec9407a28b2
font_01_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 18520 bytes
SHA-256: 3afaa4bc8721c48c8a7d3d405788c0379fe92adc985c9125566e0ad257a0092b

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