Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfda612b10daa9b…

MALICIOUS

PDF

88.6 KB Created: 2021-06-11 20:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: abbfda2d26ea9058fa1519453b00c09f SHA-1: ceecc38549987987c673eed5264bc548f6c90e1b SHA-256: cdfda612b10daa9b081c59c86392933db0f67efaf61cd595b11cb01201dd7e22
194 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/pbw?utm_term=convert+pdf+to+excel+without+software PDF link annotation
    • https://torurukiruxo.weebly.com/uploads/1/3/4/5/134529807/157ca592e367ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476126/normal_5fd6cdcc817d6.pdfIn PDF document text
    • https://doretufokisa.weebly.com/uploads/1/3/1/4/131438244/8746722.pdfIn PDF document text
    • https://nefopebawobujo.weebly.com/uploads/1/3/4/3/134380481/guwuligata-gokajedo-bidojagil-bugof.pdfIn PDF document text
    • https://forelidik.weebly.com/uploads/1/3/0/7/130775511/rowikotozoxevutojusu.pdfIn PDF document text
    • https://xadijonoru.weebly.com/uploads/1/3/3/9/133997446/vaxigavib-jovivaximew-xebuna-zefivi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446915/normal_5fd7a884804e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374840/normal_60478e87b755e.pdfIn PDF document text
    • https://moxuludo.weebly.com/uploads/1/3/4/7/134759924/mufepemuxukepatubis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417032/normal_5fd3bd0f84a5c.pdfIn PDF document text
    • https://xozavakude.weebly.com/uploads/1/3/4/5/134581018/8cd4c720335f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruwomodanom.pbworks.com/f/momo_traders_brady_dahl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00fd0ea5-10ea-4fb9-8a99-bf902e7963b5/panasonic_kx-tgp550_sip_dect_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2888419-f588-4c86-81cc-0bc5f6fb4aa3/cant_stop_the_feeling_justin_timberlake_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a0e49d-87ba-4d7d-a424-ef732777eac1/tutorial_excel_macros_vba_free_download.pdfIn PDF document text
    • http://rimogeto.pbworks.com/w/file/fetch/145143960/wwe_2k20_download_apk_obb.pdfIn PDF document text
    • http://refarumiba.pbworks.com/f/22561578227.pdfIn PDF document text
    • http://jowugaredite.pbworks.com/w/file/fetch/145006065/escuela_para_adultos_para_aprender_ingles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62f1fc83-b666-4819-85aa-2529b32d25f1/how_to_reset_ifit_treadmill.pdfIn PDF document text
    • http://xelivolofuso.pbworks.com/w/file/fetch/144951969/free_boogie_woogie_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82f08a3c-4377-4c0d-8801-d47ac787ff68/fudikaweleber.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 6512 bytes
SHA-256: e5472b6cc7fbb794d38dc7b6dbe1225f1d0113edd56af538979462a462a23002
font_01_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 5368 bytes
SHA-256: 2210a504ce3e18f00f0cddc4342243e063ff2206534d87266e64d9c3b651b867
font_02_sfnt_off00011b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B56 10464 bytes
SHA-256: 60237b28323c3e3aa155c856cc9a581e725f74357eaaa40b224a63b2114a4d9e
font_03_sfnt_off00013f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5F 16148 bytes
SHA-256: 64f21e55c2f29c6f605e8f9fd96e7f7b34f9b4a26fdc717ddead948457370e3b