Malicious PDF — malware analysis report

Static analysis result for SHA-256 3adc129b27523447…

MALICIOUS

PDF

75.8 KB Created: 2021-05-21 17:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04f036720b2d18d644508a822633a341 SHA-1: 13347a54e05c80cc32fce26669c773b53d345ee1 SHA-256: 3adc129b27523447987c8a8f5300bbb32c6c81b780fcd43776857b3f53a0ae7a
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting services, suggesting a link farm or SEO spamming operation. The primary URL, 'https://kuzutuzo.ru/wb?keyword=what%20is%20a%20cause%20and%20effect%20fishbone%20diagram', is presented as a search result, likely to deceive users into clicking through to malicious or unwanted content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wb?keyword=what%20is%20a%20cause%20and%20effect%20fishbone%20diagram PDF link annotation
    • https://penomagara.weebly.com/uploads/1/3/2/6/132695387/b13383cc8f8983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450248/normal_6050582fc6ab7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448100/normal_601247e9ebc99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418399/normal_6044dbd2d617e.pdfIn PDF document text
    • https://gebodakejodige.weebly.com/uploads/1/3/4/3/134316683/3812992.pdfIn PDF document text
    • https://betedodokadez.weebly.com/uploads/1/3/4/8/134882186/e6b7f4b.pdfIn PDF document text
    • https://zubosevofugojat.weebly.com/uploads/1/3/4/3/134307347/xedepofoserasujaw.pdfIn PDF document text
    • https://jebapawobukil.weebly.com/uploads/1/3/4/5/134521284/553fb319480c9.pdfIn PDF document text
    • https://paseruvuweduzuw.weebly.com/uploads/1/3/1/4/131437476/5719c0.pdfIn PDF document text
    • https://vadiduriku.weebly.com/uploads/1/3/4/4/134445950/topexukerise-kugumekutefu-varoviba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_60516fdc915e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tevigotu/kibuzidirisosokaluzora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c89811b-d842-4df2-b24e-64eacd164d64/olx_ventas_de_amplificadores_de_sonido_usados.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78fd2a19-bc44-463f-843e-30f9ea452b41/xukurutosuwokovox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0529c788-198e-4c1e-ad53-87701a13e8ae/what_does_the_ged_social_studies_test_consist_of.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f7e02d1-e39a-48b9-86ff-fc37eff01616/jafitunebu.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/menozulan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce98188-3e34-4fcd-a104-0e7ff7d83592/survival_games_2020_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/92683431206.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/gamipizezatoxabaj.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_off0000e8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 5556 bytes
SHA-256: ff1f593df8c6e741bf4e34592bf7c233f5a4c51c945e5cb85ff38dcf093a196e
font_01_sfnt_off0000fbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC6 11300 bytes
SHA-256: 98df4cfd16cd60b24b53e4d45f86f4a603cf23852a7c392d16ea24ddb0331149