Malicious PDF — malware analysis report

Static analysis result for SHA-256 c403ff303a25e110…

MALICIOUS

PDF

77.9 KB Created: 2021-06-06 12:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c5dcf431f96fc9323f4dd06217eee032 SHA-1: ecbfafb137b9a06a915b847f1b0a1b497cf4d5e9 SHA-256: c403ff303a25e11008964e1efca40ce1e2fde763b9a43b7b0fa558a9c5ff934e
134 Risk Score

Malware Insights

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

The PDF document contains JavaScript actions and a significant number of external links, indicating a potential attempt to manipulate search engine results or redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious. The presence of JavaScript suggests it may be used to execute further malicious code or facilitate the redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/pbw?utm_term=can+i+connect+chromecast+to+receiver PDF link annotation
    • https://faxovidovatage.weebly.com/uploads/1/3/4/3/134378957/ea023d8d1.pdfIn PDF document text
    • https://fivefijoxiwu.weebly.com/uploads/1/3/1/4/131453543/1450013.pdfIn PDF document text
    • https://fuzaterolipi.weebly.com/uploads/1/3/1/4/131438829/7287607.pdfIn PDF document text
    • https://jumitugiputetiv.weebly.com/uploads/1/3/5/3/135313018/subagibosow.pdfIn PDF document text
    • https://lesidodulutenem.weebly.com/uploads/1/3/4/3/134352412/6681853.pdfIn PDF document text
    • https://kenodajeto.weebly.com/uploads/1/3/4/4/134490943/729286.pdfIn PDF document text
    • https://jipukikibowema.weebly.com/uploads/1/3/4/6/134633032/dirirepib.pdfIn PDF document text
    • https://jojipizi.weebly.com/uploads/1/3/1/6/131606457/govusobaf.pdfIn PDF document text
    • https://nekemefewebewon.weebly.com/uploads/1/3/7/5/137504470/8335360.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/ventaja_del_microsoft_test_manager_2015.pdfIn PDF document text
    • http://joraxakegeg.pbworks.com/w/file/fetch/144576522/what_are_the_primary_goals_of_sustainability_rgpv_notes.pdfIn PDF document text
    • http://divogatupum.pbworks.com/w/file/fetch/144704628/kidatatuxapipober.pdfIn PDF document text
    • http://wuranosa.pbworks.com/w/file/fetch/144683286/download_gta_5_for_android_full_apk_free.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/f/xevegi.pdfIn PDF document text
    • http://disisopaz.pbworks.com/w/file/fetch/144659370/21413798535.pdfIn PDF document text
    • http://mifudatu.pbworks.com/f/jalusetefewusumiz.pdfIn PDF document text
    • http://jitijaloj.pbworks.com/f/my_dog_has_brown_patches_on_his_skin.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/bengali_movie_bondhu_full_movie.pdfIn PDF document text
    • http://vugufosenene.pbworks.com/w/file/fetch/144712233/sisitadiriviv.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/w/file/fetch/144684246/pubg_mobile_lite_mod_apk_unlimited_health_download.pdfIn PDF document text
    • http://ruxafonan.pbworks.com/w/file/fetch/144685323/ps3_emulator_windows_10_32_bit.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_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 4876 bytes
SHA-256: 510cdc32eaddd7af80b22b2c93d35e05db4b3ef8327da1d5eee0937a8ef2a220
font_01_sfnt_off0000f911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 10084 bytes
SHA-256: 36769e694bb1d0b8577b7d6c4c6766a9aa2d6252fef5eb4f2a18b3d5bcf46117
font_02_sfnt_off00011b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B65 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c