Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2daff9d620768c0…

MALICIOUS

PDF

86.0 KB Created: 2021-06-05 20:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 610b4b0b945a539cf14f6f7111bb8d63 SHA-1: 1162108f0a43ed3435b5c1b62d3e8f51ed43000d SHA-256: d2daff9d620768c02e2c0176420948196b1b7c8ba7e82f907cee4e0d616fd72e
226 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://smidgel.ru/pbw?utm_term=what+are+some+cool+city+names PDF link annotation
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/koxes_buwinisokimexeb_vilomepixopi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486354/normal_6038f8bb0d2fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446399/normal_6049889a66bef.pdfIn PDF document text
    • https://xogupugisi.weebly.com/uploads/1/3/4/1/134109029/xasonananevibepebo.pdfIn PDF document text
    • https://wotipivas.weebly.com/uploads/1/3/1/4/131482993/aaf169947.pdfIn PDF document text
    • https://dibixudu.weebly.com/uploads/1/3/4/5/134528380/vumewedabo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455195/normal_5fe20774cf531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374181/normal_6017298e9293c.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/2d52bbba-c7f6-4ecd-be7f-fd4c4c080496/52006068564.pdfIn PDF document text
    • http://gaguseka.pbworks.com/f/how_to_fix_lg_washing_machine_oe_error.pdfIn PDF document text
    • http://lesokulovisu.pbworks.com/f/michelin_star_guide_egypt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/019fe817-b4db-415f-b953-0494f6343484/housecroft_sharpe_inorganic_chemistry.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144428085/winrar_password_unlocker_online_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f70aff02-994f-4875-9ab6-c68308ff94f2/kufosexuxuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11157de-c5ba-4dbc-bd27-339da8b20523/astm_a328_steel_sheet_piling.pdfIn PDF document text
    • http://nugewil.pbworks.com/w/file/fetch/144649638/how_to_connect_phone_to_kenwood_rc-m1824bt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66352a11-4f73-42c0-a1b7-60f87b9cd7c3/kefarobegazoxokuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bf5c822-8d53-4124-bdd0-04e9a8ff1deb/los_12_sintomas_de_la_borrachera_seca.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/60377656162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e6f4c3f-1ac9-40db-a0e2-434ae411365a/89808825363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9684bc9-7b35-45bc-b84c-9ef2d836f450/download_game_dream_league_soccer_2015_mod_apk_offline.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_off0001120a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120A 5156 bytes
SHA-256: 0dd76260b0d55cebdacffef18d11869feb0d7ce2fcd78c982e21d1695702450d
font_01_sfnt_off0001237a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237A 11572 bytes
SHA-256: fec1678016e22d84c4a79eb753000d1cf57a53fb65839661dcb9bb7b6bad356c