Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c434c6b5b64ff87…

MALICIOUS

PDF

74.9 KB Created: 2021-05-05 16:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 33c4cf660aecc26d7620111d094b2fde SHA-1: 607c72a8b974ded21574d3144cf2f05f8a557071 SHA-256: 5c434c6b5b64ff8732cdff2f7177057083ac57db21566fb4686bb717ab7dc071
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/strik?utm_term=weathermaker+8000+trouble+codes PDF link annotation
    • https://pazaduzot.weebly.com/uploads/1/3/4/4/134473777/lakaxededezin_lakireverarin_siked.pdfIn PDF document text
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/8214608.pdfIn PDF document text
    • https://wedezetepeb.weebly.com/uploads/1/3/4/5/134528952/5564553.pdfIn PDF document text
    • https://tedomidile.weebly.com/uploads/1/3/2/7/132712102/3209c55d78fc0.pdfIn PDF document text
    • http://dronextactical.xyz/7466353118kjvd7.pdfIn PDF document text
    • http://lezuxifusi.22web.org/can_i_annotate_in_ibooks.pdfIn PDF document text
    • http://pazolozul.mypressonline.com/amazing_grace_clarinet.pdfIn PDF document text
    • https://jenafowumavadas.weebly.com/uploads/1/3/1/4/131437472/lelanewelibenesuti.pdfIn PDF document text
    • http://likododolokopaj.iblogger.org/authorized_letter_for_gst_format.pdfIn PDF document text
    • http://easylearning.space/how_long_do_duracell_car_batteries_lastbn113.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/pdf_to_word_converter_online_direct_download.pdfIn PDF document text
    • https://bonopabugo.weebly.com/uploads/1/3/4/5/134581776/9f9aa98c8d6099c.pdfIn PDF document text
    • https://faremuxonebaw.weebly.com/uploads/1/3/4/5/134598019/8620692.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/92697737996.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/9836190819.pdfIn PDF document text
    • https://fusorebumobem.weebly.com/uploads/1/3/3/9/133986296/tekup.pdfIn PDF document text
    • https://gefeteki.weebly.com/uploads/1/3/4/3/134310298/kidigijoju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/the_spectacular_now_full_movie_download_with_english_subtitles.pdfIn PDF document text
    • http://muvamubas.atwebpages.com/actos_de_habla_ejemplos_y_ejercicios.pdfIn PDF document text
    • http://sudiwoke.epizy.com/tenibeliwesolutazavesepe.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/32469817370.pdfIn PDF document text
    • http://dikumetuvo.epizy.com/xoboj.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/special_casual_leave_application_format.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 5732 bytes
SHA-256: 812688ef56135367c4357c729397a448e98639231708ff39b3225f6a331be4ca
font_01_sfnt_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 11036 bytes
SHA-256: ff3787ab9136882dccfbf795cb93ffd940fd8df2eecdca2a8814dfb359cce37c