Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8af6561af5625d…

MALICIOUS

PDF

76.2 KB Created: 2021-03-27 23:33:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: aed4bfd40aff1d4b40ebd94aa4233f12 SHA-1: 8e19cd1fd646800d5dfeae742f65d856a493f612 SHA-256: 8f8af6561af5625d8297dcf6910f9afb1532f24fffbcc8ccc82cbb3d2b38fd32
186 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. 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 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/123?utm_term=campbell+biology+chapter+6+study+guide PDF link annotation
    • https://cdn.sqhk.co/duporetixi/gVtLI0A/bihar_masti_bhojpuri_song_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472185/normal_604e0aae59728.pdfIn PDF document text
    • http://ottics.ru/802956866960903s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483873/normal_5ffa3df9ad505.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/jinjhfe/dynasty_warriors_4_wu_characters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448137/normal_602b5923f039b.pdfIn PDF document text
    • https://cdn.sqhk.co/gexopoku/hjXjgTR/real_gangster_crime_simulator_3d_mod_apk_download.pdfIn PDF document text
    • http://rameautbxy.space/838154252170abwd.pdfIn PDF document text
    • https://rewekofewu.weebly.com/uploads/1/3/4/6/134654248/xozul.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/pifitinekire.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/hxhg82Y/zurutalugamuxurujawita.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446492/normal_6034706c6423b.pdfIn PDF document text
    • https://vugosolisaxude.weebly.com/uploads/1/3/2/8/132814967/4970990.pdfIn PDF document text
    • http://soldonlakewood.com/59809805303uzte8.pdfIn PDF document text
    • http://springtea.space/unidad_1_etapa_2-ws4_answerscwf04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453900/normal_5ffa8c2cc1c75.pdfIn PDF document text
    • http://newyearshop.site/mijopigebikaigmpw.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/gNejcid/niv_study_bible_software_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/gmZiCgj/royal_caribbean_international_cruise_ship_pictures.pdfIn PDF document text
    • https://telazavax.weebly.com/uploads/1/3/4/7/134729689/3c2896ff7571.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/61706e22-e2b0-4769-874f-395ac7f8ff8f/30980937642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c2575b3-36d0-4fa1-a9b3-d32f544d048c/what_is_the_sun_rising_by_john_donne_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7358a49-9f10-42c7-8cdf-e3ff402567ed/soccer_drills_for_4_year_olds_video.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_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 5788 bytes
SHA-256: ca019cfc76137946fd8f462361b3da7e1c96593d9619a12fa8b2bb7d0c1e70de
font_01_sfnt_off0000facf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 12756 bytes
SHA-256: 0a6c100b213cd2e8423461b849845e91580294e13de1dff1c158a8c2d3ce1f44