Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad7809dbd962883…

MALICIOUS

PDF

77.6 KB Created: 2021-06-02 19:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 320b4d9dccfe2ef98b5834c5d274f9bf SHA-1: 570d41fd7ce027fc4cd71007750020f341cccd2a SHA-256: cad7809dbd962883071e6740f9d370c1d028ab9564a885b5d67390e2cafb7542
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The primary function appears to be a link farm, containing numerous external URLs pointing to other PDF documents, which is a common technique for SEO manipulation or distributing further malicious content. The presence of multiple external links on disposable hosting services further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/123?utm_term=irregular+verbs+worksheets+pdf PDF link annotation
    • https://tedamitaza.weebly.com/uploads/1/3/0/7/130740371/a4bbb3.pdfIn PDF document text
    • https://matupazuru.weebly.com/uploads/1/3/2/6/132681479/467f12b1d5783.pdfIn PDF document text
    • https://mewukonil.weebly.com/uploads/1/3/4/0/134096476/239336.pdfIn PDF document text
    • https://pozimetotekiv.weebly.com/uploads/1/3/4/3/134339641/9cbd8.pdfIn PDF document text
    • https://jubagimijan.weebly.com/uploads/1/3/5/3/135333733/pomurek.pdfIn PDF document text
    • https://natadafupekex.weebly.com/uploads/1/3/1/8/131856288/8075790.pdfIn PDF document text
    • https://nirotagikul.weebly.com/uploads/1/3/5/9/135992947/955017.pdfIn PDF document text
    • https://medotufise.weebly.com/uploads/1/3/4/5/134512565/4791101.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vejivab.pbworks.com/w/file/fetch/144462363/mebesobomawanitadigakawan.pdfIn PDF document text
    • http://risoxef.pbworks.com/f/twilight_saga_all_part_full_movie_in_hindi_download_480p.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144419187/do_blue_dye_tests_always_have_a_faint_line.pdfIn PDF document text
    • http://gonumutat.pbworks.com/f/lulufob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b1889bb-96a0-4d3e-977c-a7daa56d814b/89870565218.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/f/xovinenirafojamix.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/fahrettin_razi_tefsir_oku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11849576-8a7d-4acf-91e5-eb6e5d2fa919/kedetuvikuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2d7008b-9bc8-40d3-a066-45d66e7f952f/vidudiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5993c821-e92b-487b-9de2-1205c8f62fb9/how_to_use_dremel_3000_to_cut_wood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a75ad317-a114-43d0-acb3-c09abe61dba6/kobalt_10_inch_miter_saw_guard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ced5023a-00a3-4c3a-a607-1a2dcebd8f37/lizefukugikigebavepo.pdfIn PDF document text
    • http://pijipusap.pbworks.com/w/file/fetch/144472959/pokemon_go_mod_apk_latest_version_2021.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/f/happymod_apk_for_windows_7.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_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 5596 bytes
SHA-256: 7206ef9889fcddc90090adaf82392fb9aea775af190806535389990816f00c00
font_01_sfnt_off00010429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 10868 bytes
SHA-256: 2d89368788b577ca2f7d0a424750f10eb494b67b381bb8caadf03329007c721d