Malicious PDF — malware analysis report

Static analysis result for SHA-256 c553ffe49a3c9072…

MALICIOUS

PDF

84.1 KB Created: 2021-04-13 18:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90683665eac12f6175e944323fb9ca81 SHA-1: 9f13f7d8bceed46421401cf2c08a181bdfeecc3e SHA-256: c553ffe49a3c907296cb7659db7b58f8e010f4d417ab1b47869f20796d31cf1d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external URIs points towards a redirection mechanism to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=books+50+shades+darker+and+50+shades+freed
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/16dbf.pdf
    • https://static.s123-cdn-static.com/uploads/4387807/normal_5ff904c39d30f.pdf
    • https://wovenatoz.weebly.com/uploads/1/3/1/4/131454427/ridokabobi.pdf
    • http://volanorirabu.22web.org/the_story_of_my_life_summary.pdf
    • https://rugabefek.weebly.com/uploads/1/3/0/7/130775918/3982303.pdf
    • https://cdn.sqhk.co/xenivoronizu/bLgibyp/30503605653.pdf
    • https://cdn-cms.f-static.net/uploads/4493209/normal_60233d14607a7.pdf
    • https://jamoniti.weebly.com/uploads/1/3/4/4/134486399/wuvopujira-gofuvewo.pdf
    • https://cdn.sqhk.co/vovewotutal/eeibca8/dukemareb.pdf
    • http://gepavozo.mygamesonline.org/arabic_quotes_with_english_translation.pdf
    • http://gifagudilul.mypressonline.com/62888215719.pdf
    • https://farukipem.weebly.com/uploads/1/3/4/4/134473356/defizoruz_niruvagan.pdf
    • https://suduwigopoda.weebly.com/uploads/1/3/4/5/134587425/rusijiwif.pdf
    • https://cdn.sqhk.co/nixagigad/fbiagci/guide_for_fall_guys_game_walkthrough_download.pdf
    • https://rulipativix.weebly.com/uploads/1/3/1/6/131607363/09185.pdf
    • https://zugixipenelir.weebly.com/uploads/1/3/4/5/134591811/mamatuji.pdf
    • https://cdn.sqhk.co/juzurupivepo/gFppGgd/emu_2600_xl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zoligagomuwe.onlinewebshop.net/sherlock_holmes_a_game_of_shadows_full_movie_download_in_hindi_hd.pdf
    • http://roniwixanedif.epizy.com/reminder_letter_for_outstanding_payment_template.pdf
    • http://serumisa.epizy.com/subaru_forester_2010_review_consumer_reports.pdf
    • http://bejanifezilo.atwebpages.com/30961970276.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108f9.bin
981448d917c2bbe63d9775b34f48721a5276351c3c7713abb5f8fe424929d228		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108F9 5340 bytes
font_01_sfnt_off00011b2b.bin
244a9d0ab732394bd73ba030004fb1711cd98189787b90677aabf61cd22f6a1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 11816 bytes

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