Malicious PDF — malware analysis report

Static analysis result for SHA-256 694c6e471fc85c2e…

MALICIOUS

PDF

79.4 KB Created: 2021-03-15 18:23:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c35cb1bd5bd0ce304be606c3c6452a6d SHA-1: cecda34fa7c0f52136d46ecf8bce8b643b41c709 SHA-256: 694c6e471fc85c2eced215431d6b6ef2558e80e2583f4200c82cfe4d4b20995e
204 Risk Score

Malware Insights

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

This PDF document contains a link farm and an SEO redirector, indicating a phishing or malware distribution attempt. The primary malicious URL identified is https://kuzutuzo.ru/strik?utm_term=make+money+online+apps+download, which is likely used to deliver a second-stage payload or redirect to a phishing page. The presence of multiple external links and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=make+money+online+apps+download PDF link annotation
    • http://blankid.ru/degamidufugafitatigetirazcncz6.pdfIn PDF document text
    • http://proita.fun/979138058563ro1.pdfIn PDF document text
    • http://betmoy56.com/the_prayer_of_jabez_king_james_versionxlz5t.pdfIn PDF document text
    • http://ehaberdevlet.com/the_queen_of_attolia_read_online_freevnimq.pdfIn PDF document text
    • http://autoport76.online/matura_podstawowa_angielski_wiczenia_leksykalno_gramatyczne2px07.pdfIn PDF document text
    • http://italiahot.fun/49787693451d7w86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/866bb319-a32f-4d14-ba8d-68505a858179/59848610808.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/how_to_start_a_legal_memo.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_454d498a6ffd4f1482ca5ddade88dcf2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/bhoy_dekhas_na_please_song.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/16394069695.pdfIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_944943a3db974906aded46deb1977fa8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/sekeletegirobovojupebo.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/11963564757.pdfIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_75b2992e8a4c458596bc1947c11fa11c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/baixar_livro_temperamentos_transformados_em.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/tipos_de_grupos_sociales_para_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b8bf56f-8097-401f-b1af-138ecb94b6e4/83167151773.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/2014_gmc_sierra_build_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/moripuralofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13e2d029-a008-49f5-9c04-1da4890822f8/jujaturaruxa.pdfIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_de501d0014934f30b438fef4c988a3b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/pasavovadumixaroropodituk.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_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 5272 bytes
SHA-256: c8365e86ec044332c6523ae4610df3a50ef7e91ac4eb4032038d35be166ab949
font_01_sfnt_off00010756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10756 11756 bytes
SHA-256: c1d0bb0680aa3cc8fd7bc519b1c67a3506bb69eeed745b4950a55ddb8833c5dc