Malicious PDF — malware analysis report

Static analysis result for SHA-256 930b354f7e2b2292…

MALICIOUS

PDF

70.4 KB Created: 2021-03-06 07:01:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ac473808ddc0c585f6a97937c24b0131 SHA-1: 7fac9c732c86f3d1e5a14c11ff9df74457e6268e SHA-256: 930b354f7e2b2292ab9520667fedc5a6d980e8e010103343c9553b4c55e43ee4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The PDF contains a large number of external links, many of which are SEO-optimized, suggesting an attempt to drive traffic to malicious sites. One prominent URL, https://seumenha.ru/strik?utm_term=case+in+point+10+complete+case+interview+preparation, is directly linked to the file's apparent lure of interview preparation materials. The presence of PDF_SEO_LINK_FARM heuristic further supports the malicious intent of creating a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://seumenha.ru/strik?utm_term=case+in+point+10+complete+case+interview+preparation PDF link annotation
    • http://pimifawimonidij.mywebcommunity.org/how_to_clean_hamilton_beach_easy_reach_toaster_oven.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/xoponiwasal.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/plantronics_c054_pairing_to_base.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_8226d378d65d4de8aaf199905a3cd49a.pdf?index=trueIn PDF document text
    • http://jomexikosuzujis.rf.gd/maxenakop.pdfIn PDF document text
    • http://widevuwototavu.rf.gd/soul_music_dj_mix.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/good_food_guide_vegan_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/boney_m_christmas_songs_lyrics_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2e164ec-06bc-4584-8068-609bd91a1cd3/matlab_anonymous_function_with_two_outputs.pdfIn PDF document text
    • http://pexirud.onlinewebshop.net/26023222825.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/who_is_the_new_miss_usa_2020.pdfIn PDF document text
    • http://vinegufoxa.rf.gd/wivaxibibusinomuno.pdfIn PDF document text
    • http://muxuzuvom.epizy.com/dissection_of_cockroach.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5892d06-5c9f-4a51-acc9-e266d613e148/the_book_thief_quotes_about_death_with_page_numbers.pdfIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_31f09bd23403498baf5727de283ed3ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejexe/katalon_html_report_jenkins.pdfIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_e32c4e067f824dfaa75c05d2db4fbaa1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/batman_killing_joke_full_movie_free.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_off0000d603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD603 5332 bytes
SHA-256: 4033246752ed7fafad5aff80474313512148d440b8a90d0cf04548ce38618899
font_01_sfnt_off0000e81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 10464 bytes
SHA-256: 9e31d88579908006f46be62b66ac20aac546e3ef4dde08ca8c3867e38c81453f

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