Malicious PDF — malware analysis report

Static analysis result for SHA-256 163af57666dc1af1…

MALICIOUS

PDF

84.1 KB Created: 2021-04-10 01:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 52ed0d99771bece789a8e41cddc4f9a8 SHA-1: 35f64f6b46254b64b38a4cd33a0371a021cc113f SHA-256: 163af57666dc1af1346d3ff3d6399429310d4805e6ebd24c802cb2ae1f841cc6
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the overall structure suggest the document is designed to trick users into visiting malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://xezojetit.ru/strik?utm_term=hp+officejet+6500+e709+wireless+setup PDF link annotation
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/9036371.pdfIn PDF document text
    • http://fajufoturesu.sportsontheweb.net/faginojofupokavabusif.pdfIn PDF document text
    • http://fibaxoxadomi.sportsontheweb.net/binarismo_de_genero.pdfIn PDF document text
    • https://bageriwiko.weebly.com/uploads/1/3/2/8/132814239/1362689.pdfIn PDF document text
    • https://danivuzi.weebly.com/uploads/1/3/2/6/132681213/pujutifekujuronoweda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_604f322bc8e4f.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/goji_smart_watch_manual_dansk.pdfIn PDF document text
    • http://avtoshkola-region26.ru/how_to_blend_single_stage_urethane_paint7ks79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451225/normal_5fe3a9b7a391c.pdfIn PDF document text
    • http://pokemonrivals.online/466548878348pll3.pdfIn PDF document text
    • http://dkmz1.club/barbie_doll_wallpaper_photosuqeyx.pdfIn PDF document text
    • https://nibivesulekot.weebly.com/uploads/1/3/4/0/134017222/bilukeva.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/45515398624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_601ab40d52314.pdfIn PDF document text
    • http://pemotutafid.mywebcommunity.org/63376318558.pdfIn PDF document text
    • http://investmag.org/kannada_mp4_audio_songs_freejnz8q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448536/normal_602366fb1448b.pdfIn PDF document text
    • http://kumajamefe.getenjoyment.net/rotary_engine_parts.pdfIn PDF document text
    • https://xawavefite.weebly.com/uploads/1/3/4/6/134667803/15aa69a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384459/normal_60062a6eb3bee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/21506e0a-9920-44d2-a10f-640734ac3c2f/9849116396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b09fda8-9888-4be9-b121-704f15a27e62/logitech_mk330_unifying_software.pdfIn PDF document text
    • http://zeroxezubanalil.onlinewebshop.net/mokofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5efc3f0-0fdf-4d7c-b2bb-0134d444217a/jensen_cd_560_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb232b61-7089-4bf0-a900-dfc371396120/sumifonewuleguvevivedaweg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd3e690-4ad0-4a24-aebc-4b8d76b49a43/ganimukifotuvurerajavorir.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_off000105ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EC 5584 bytes
SHA-256: 41616b3bb53755f1f489e2f005f36ce6dd308c104c4adb0f1c05e03177d01d67
font_01_sfnt_off00011923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 11856 bytes
SHA-256: da2ab3915e90b5237474d0f951a08118cc4fe77e2ef59a27e04d7f7da6e12f88