Malicious PDF — malware analysis report

Static analysis result for SHA-256 230f9be0bf7aff74…

MALICIOUS

PDF

78.4 KB Created: 2021-03-31 18:39:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fe67083e9ec75c9f64e6b60b1f4d6fb4 SHA-1: 8123c481933ecb351df5d6739cac2560f4dc1de3 SHA-256: 230f9be0bf7aff7437e283717ff9b821d4adba5c98f2878156e28810fde47446
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9990

Heuristics 5

  • 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 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://xajibur.ru/123?utm_term=pct+applicant%2527+s+guide+national+phase+us PDF link annotation
    • https://biwemazisemu.weebly.com/uploads/1/3/0/9/130969041/25bd5d356e7d6.pdfIn PDF document text
    • https://nimijakis.weebly.com/uploads/1/3/4/5/134577625/dikinul.pdfIn PDF document text
    • http://sewalenugebob.iblogger.org/basel_committee_on_banking_supervision.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/bij7oey/snes9x_ex_1._5._37_apk.pdfIn PDF document text
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/9690132.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/giigchj/79202198282.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/hhPgffg/happy_fall_yall_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/mjfhjex/baldi_s_basics_calling_school_simulator.pdfIn PDF document text
    • https://cdn.sqhk.co/xamizine/ahi4Uih/blooms_today_work_from_home_reviews.pdfIn PDF document text
    • https://vajalumodo.weebly.com/uploads/1/3/4/3/134390135/gavopi-sepebumegonipa-xutovuzalizag.pdfIn PDF document text
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/ralovupurekofagil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bewebumaxof.epizy.com/chicken_katsu_curry_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/39947265441.pdfIn PDF document text
    • http://gusubozavagu.epizy.com/salib.pdfIn PDF document text
    • http://rigirulame.epizy.com/shaman_king_amidamaru_spirit_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b32d67e-bfce-489b-a1cf-966b0149c2ce/gogikanub.pdfIn PDF document text
    • http://nidalufexif.epizy.com/ruweboga.pdfIn PDF document text
    • http://vakusidoler.epizy.com/cg_song_mp4_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dea0853e-d68d-44c1-9b79-4a8a194ae18b/bukosumelatugupinosepiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/vaxuzidet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80301b92-4cbe-412f-afa5-faf25934d5be/what_is_narrative_paragraph.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ae9f82-f9e0-4cd9-b4ce-fda455cc9dfc/593122045.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/pixidakofiti.pdfIn PDF document text
    • http://puvidideja.rf.gd/81014551266.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 2904 bytes
SHA-256: 5a72c97f611802d6f9b2735b8c0c3331a74e2b68b410076e34034b6674823516
font_01_sfnt_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 5272 bytes
SHA-256: 1d7d569c403b31c37282d3360b5ea78921fffe3528db1845de8c12b1ba91f5b0
font_02_sfnt_off000107f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 10676 bytes
SHA-256: 26011f6f4649313094adb36f45c5aa8c34260161add35c20acd85ad924eeb801