Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3b62b3ac906282…

MALICIOUS

PDF

82.7 KB Created: 2021-05-07 15:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d772f01381eabf92263eb5fd03722c86 SHA-1: c5823f40730f583a08baa8ee303d46ae57edad1b SHA-256: af3b62b3ac906282593487acd71a3d10f01fd6653e573dda986c512a8f623af8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://golowaki.ru/strik?utm_term=football+coaching+sessions+for+8+year+olds PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472206/normal_6023649436928.pdfIn PDF document text
    • https://cdn.sqhk.co/rodesedaded/BgdmsTY/61511753700.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378149/normal_5ff3e2f478d34.pdfIn PDF document text
    • https://cdn.sqhk.co/feduvefas/ijuAghP/safoziw.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/zozidosas.pdfIn PDF document text
    • https://cdn.sqhk.co/lamijaluxeso/Yhghheh/unblocked_games_76_basketball_slam_dunk_2.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/hiidiDL/beast_quest_series_11_12_13.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/1GxhaBk/bubble_world_pet_spa_store.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_601ad6aa76091.pdfIn PDF document text
    • https://jukirabupunux.weebly.com/uploads/1/3/0/8/130874410/goruku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475734/normal_5ff8d937e5c84.pdfIn PDF document text
    • https://cdn.sqhk.co/zibusisujij/jhhaaXN/cosmic_kids_yoga_pokemon.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/c5hk8Zi/hotel_pennsylvania_new_york_city_booking_com.pdfIn PDF document text
    • https://sojagimizalafar.weebly.com/uploads/1/3/5/3/135317111/2ec49b4d.pdfIn PDF document text
    • https://cdn.sqhk.co/sojuzafu/5iaK2ih/polaris_roller_coaster_kings_island.pdfIn PDF document text
    • https://xujufefar.weebly.com/uploads/1/3/1/4/131483110/gofasedenuvinus.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/iWqrphc/vevusaxub.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/fuih1jb/27199850539.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/nazefomujiwutegelejexaku.pdfIn PDF document text
    • http://xomunuxeju.sportsontheweb.net/how_to_glaze_a_smithfield_spiral_ham.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_88eecf7fd6674c62b5ddebcd1dcbf0d1.pdf?index=trueIn PDF document text
    • https://9dd02728-8b0e-4c16-8a5b-31b14a6ec887.filesusr.com/ugd/d8c3ed_05f2419a956a4ee3a41bfc7bf02e4d79.pdf?index=trueIn 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_off000104f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 5676 bytes
SHA-256: f7af18710d89a1d53d9f6b285812311111ba5af9d4f24bad56f33f0d465fdefd
font_01_sfnt_off00011838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11838 10768 bytes
SHA-256: 12d95da4d35f93fc10d97840cbdb6bf55dee5e6f4e4424177b058b370a57ecd2