Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce6141d3ce40db5…

MALICIOUS

PDF

83.5 KB Created: 2021-04-16 14:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab7a99487d032d9cfc7985dc471766ee SHA-1: 255cf01e21bc5d0e6042f67dee02c93f8bf08cbb SHA-256: 8ce6141d3ce40db540bfa32ff98ec160c161389fb75833491e8ac713605f30be
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to other PDF documents, suggesting a link farm or SEO poisoning tactic. One of the primary URLs, https://kuzutuzo.ru/strik?utm_term=how+do+you+factory+reset+a+dell+venue+8+pro, is likely part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate maliciousness, with the latter identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=how+do+you+factory+reset+a+dell+venue+8+pro
    • http://moneyindia.site/your_love_never_fails_never_gives_up_piano_chordsrizuf.pdf
    • http://extraterrestrials.space/79390197328pvfzd.pdf
    • http://creditscorehelp.info/25536803647mw7ho.pdf
    • http://drnextact.xyz/biblia_peshitta_aramea49sp6.pdf
    • http://reestr.site/tp_link_mr3040_manualwvdjz.pdf
    • http://rivozuzeno.mywebcommunity.org/96108124606.pdf
    • http://center-san.ru/irregular_verbs_chart_exercise6uoqk.pdf
    • http://coolmag.biz/96370216483wvzp5.pdf
    • http://fujigukatujewu.medianewsonline.com/forupitov.pdf
    • http://o-karte-kopilka.com/108932773543x6eu.pdf
    • http://wedidizelajat.mypressonline.com/69507634550.pdf
    • http://ladyso.ru/416630510200c02g.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sewamos/excel_vba_cells_sheet.pdf
    • https://s3.amazonaws.com/fukezavazuj/87737575013.pdf
    • https://s3.amazonaws.com/woxorojero/mivada.pdf
    • https://s3.amazonaws.com/fajixe/cuales_son_las_mejores_empresas_para_trabajar_en_estados_unidos.pdf
    • https://s3.amazonaws.com/safago/athleticare_physical_therapy_sports_performance.pdf
    • https://s3.amazonaws.com/wixanarer/brunella_gasperini.pdf
    • https://s3.amazonaws.com/sefipa/32956450402.pdf
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_919de43519c3491daa60c09c87608eac.pdf?index=true
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_59b5bad49da34cc786fe2f472d383eed.pdf?index=true
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_d3ec7e844ebd4cd3b6e73c32ee460500.pdf?index=true
    • https://s3.amazonaws.com/kufazete/formal_letter_to_fire_attorney.pdf
    • https://s3.amazonaws.com/gotitibekovi/kuwak.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_off00010741.bin
778ed1103c4f6d54ca25c4aa41729eeb0d1a6d7d5a68681e19c7bc830514d0d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 5560 bytes
font_01_sfnt_off00011a59.bin
539876018bc56b2b3c07dabaf9d4490d69e86ba4530c3f59aec47f53d4c55695		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A59 11016 bytes

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