Malicious PDF — malware analysis report

Static analysis result for SHA-256 42cc0d97dde0273e…

MALICIOUS

PDF

68.9 KB Created: 2021-05-09 22:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 00643509ca88051c6a5e6e753c922956 SHA-1: 804ad66354c584710547d72b163fb9888b04eaa6 SHA-256: 42cc0d97dde0273e12e09329c9c19e4443995705bda83e15dadfcc5c3b6bb135
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to other PDF files on disposable hosting, indicative of a link farm. ClamAV and ML classifiers identified this as a phishing or malicious PDF. The embedded URLs suggest an attempt to redirect users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=how+to+shift+eaton+fuller+13+speed PDF link annotation
    • http://itmax.info/fuvoxuraxmwoj.pdfIn PDF document text
    • https://cdn.sqhk.co/jitegoji/4jjMjjd/vefov.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/rutexa.pdfIn PDF document text
    • http://prodit.space/how_do_i_change_my_voicemail_on_my_alcatel_flip_phone991e8.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/Rptiaia/1000_words_equals_how_many_typed_pages.pdfIn PDF document text
    • https://cdn.sqhk.co/liwifetil/UijpU8n/private_downloader_apk_3._0._1664.pdfIn PDF document text
    • https://cdn.sqhk.co/lutidofele/yjgTidk/adderall_generic_brands_list.pdfIn PDF document text
    • http://tortomsk.ru/the_essential_rumi_hardcover0qgmv.pdfIn PDF document text
    • https://visigeporoxibus.weebly.com/uploads/1/3/4/1/134131572/fixuzerup_zifamidaxa.pdfIn PDF document text
    • http://zemixubekuj.22web.org/29277723646.pdfIn PDF document text
    • https://cdn.sqhk.co/diwiporeb/jejbYHi/76893866785.pdfIn PDF document text
    • http://mazafaka69pussy.online/is_gender_reassignment_surgery_free_on_the_nhsxu7zu.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/fexedumuzaxexulakupirazarb5oes.pdfIn PDF document text
    • https://teparapilaw.weebly.com/uploads/1/3/4/4/134477765/4a705570d41f5.pdfIn PDF document text
    • https://cdn.sqhk.co/jekenilegefe/MibqJhj/yandex_mail_apk_old_version.pdfIn PDF document text
    • http://paxawujaxoda.22web.org/84543731283.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rudixexo.epizy.com/accounting_terms_explained.pdfIn PDF document text
    • http://jimijafo.epizy.com/bob_ironman_double_stroller_tires.pdfIn PDF document text
    • http://sagoralezerelo.onlinewebshop.net/19029610933.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_off0000d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 5396 bytes
SHA-256: 3a0b1e35889fcc02610936bd38ea0001b4632562bbb315c9a66511e719146c4f
font_01_sfnt_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 10204 bytes
SHA-256: abfeed29843201e5b6ead7dc87ff8ad3ba146230a2fa068c0f4504ba0f2c7f19

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