Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3c5ed398fa60b4…

MALICIOUS

PDF

81.4 KB Created: 2021-06-05 14:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 433ee6792f08ba1e1172e719ee542edc SHA-1: d02a0801e068d3e04e4b701ed3020e5384ac13d5 SHA-256: ed3c5ed398fa60b426407d7689e101817279d72414f05be766f5c7acb4cb1dd2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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.
  • 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://coretry.ru/pbw?utm_term=pomada+encarnita+farmacia+paris PDF link annotation
    • https://siresikewutawin.weebly.com/uploads/1/3/0/7/130739490/8c401050.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403264/normal_6007d2ce39d25.pdfIn PDF document text
    • https://renunuvejo.weebly.com/uploads/1/3/4/7/134710344/kuzozedaxaxulis.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/08183608b.pdfIn PDF document text
    • https://dururamud.weebly.com/uploads/1/3/4/8/134846475/90f15575.pdfIn PDF document text
    • https://renokiva.weebly.com/uploads/1/3/4/3/134353994/9612215.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482027/normal_5ff9dd1c0c979.pdfIn PDF document text
    • https://purubagenipobeb.weebly.com/uploads/1/3/1/3/131398544/6c8eb02962.pdfIn PDF document text
    • https://fogipomovilop.weebly.com/uploads/1/3/4/0/134018275/jumesilewa-vesarukozo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454438/normal_601520c05a5eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427528/normal_603bfffa29b59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485579/normal_60464455401b5.pdfIn PDF document text
    • https://jipovosu.weebly.com/uploads/1/3/4/7/134728388/5d421eb60c677e.pdfIn PDF document text
    • https://nepufetok.weebly.com/uploads/1/3/1/4/131438640/kenemupewatuwapexexu.pdfIn PDF document text
    • https://woniwawel.weebly.com/uploads/1/3/4/1/134109026/4271664.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://niluputevi.pbworks.com/f/short_reading_comprehension_passages_esl.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/w/file/fetch/144426462/mit_lock_picking_guide.pdfIn PDF document text
    • http://fixiguru.pbworks.com/f/descargar_windows_10_gratis_32_bits_espaol_mega.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/17198002891.pdfIn PDF document text
    • http://joraxakegeg.pbworks.com/f/amazon.com_mytv_enter_my_code.pdfIn PDF document text
    • http://rumusapage.pbworks.com/f/naruto_online_mobile_english_version_download.pdfIn PDF document text
    • http://masawumel.pbworks.com/w/file/fetch/144420309/composicion_del_aire_alveolar_y_atmosferico.pdfIn PDF document text
    • http://nadupodifado.pbworks.com/f/can_you_rebuild_a_hydrostatic_transmission.pdfIn PDF document text
    • http://jotoxipigi.pbworks.com/w/file/fetch/144579792/what_do_you_eat_on_30_day_challenge.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/w/file/fetch/144655230/facebook_photo_downloader_chrome.pdfIn PDF document text
    • http://pokatufaxi.pbworks.com/w/file/fetch/144597216/php_mvc_tutorial_step_by_step.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144577779/35335596059.pdfIn PDF document text
    • http://nugewil.pbworks.com/w/file/fetch/144651201/notirudodubex.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/w/file/fetch/144651756/krause_and_becker_airless_paint_sprayer_harbor_freight.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/muzuwofububi.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_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 5060 bytes
SHA-256: fa7d9f8a5f86667aaa1a93304b1775b6ec3440449a0263d51b5f30c70d07e2cf
font_01_sfnt_off000102a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 11928 bytes
SHA-256: a622fc80c6ee982bb27871498dbd992c5276aa004d1e3faf5ba7a6ebc5e32530
font_02_sfnt_off00012783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12783 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230