Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08bc3b02c8b6f70…

MALICIOUS

PDF

83.9 KB Created: 2021-04-23 14:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d8466bedd98d0aa8eb8d1985f9c4ac94 SHA-1: d6d52dfb24230e78520cdb80a1b12c8ad74cee8f SHA-256: a08bc3b02c8b6f7011100d4963d87d0dde5ff155771200a005f032b6753e13fb
226 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body's text, combined with the PDF_SEO_LINK_FARM heuristic, points to a deceptive tactic to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://xezojetit.ru/strik?utm_term=clicker+universal+wireless+keypad+instructions PDF link annotation
    • http://razvivatel.blog/reporte_de_alumbrado_publico_chihuahua44rar.pdfIn PDF document text
    • https://ruzutemeba.weebly.com/uploads/1/3/2/6/132681300/8a38fc5.pdfIn PDF document text
    • https://kojulijorivo.weebly.com/uploads/1/3/4/3/134329781/c47fdf30b5ee1.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/61257623528t8c39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471719/normal_601cbfb06ae8b.pdfIn PDF document text
    • http://chaptejvxz.fun/aloha_mobile_app1e0ql.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374362/normal_60571efec3ec7.pdfIn PDF document text
    • http://gouliwer.online/83913273056j639v.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/ritokela.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/vukumesoj/principles_of_cost_accounting_16th_edition.pdfIn PDF document text
    • http://lopafulobitap.atwebpages.com/compress_file_size_to_200kb_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd48b08e-4d4d-4625-9516-28b978ed484f/the_crown_season_4_complete_cast_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/778958dc-5af3-4173-9ad7-c1ad42967074/korg_triton_extreme_sustain_pedal_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/lufadipugizulutofafodaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b501f22-18cd-4790-ae86-6e480c516c0b/fekexuwosiwenazedut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5af1b2d6-f030-4349-9e7c-825e6ff4992c/9793853238.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/javozowabomigitedazufibat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b98a680-68d1-46fb-b5d1-d3c108647e32/tableaux_de_provence_piano_accompaniment.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/31328972449.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/mahiya_mahiya_adnan_sami_song.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_off00010741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 5292 bytes
SHA-256: e02481d525f299a95f22b10ee68b6bc03b147af9ab20183f1f41e9861b1cbe99
font_01_sfnt_off00011969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11969 12040 bytes
SHA-256: 958dc4ed81e785b401accca5ff0dd47f1c9e4d6450dd4986db8d7f155c36408e