Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac70cee26d56cff3…

MALICIOUS

PDF

75.5 KB Created: 2021-04-07 04:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ddd0274d9efd878ded13b6e824d8d582 SHA-1: d5a3f0e593a08aacc8f428502c71e4a49487b943 SHA-256: ac70cee26d56cff374ca5588f0ce8882311219691fddfc338d4bc126d45174ae
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs and a heuristic firing for a 'link farm' on disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://seumenha.ru/award?keyword=workout+guide+pdf+free PDF link annotation
    • https://falijufik.weebly.com/uploads/1/3/5/3/135349852/boviwalije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421471/normal_6061f99fedb0f.pdfIn PDF document text
    • http://pegejoruvufiron.sportsontheweb.net/problemas_de_gases_en_los_intestinos.pdfIn PDF document text
    • http://newuwedeza.mypressonline.com/amazing_grace_bagpipe_sheet_music.pdfIn PDF document text
    • http://midesamipazizuj.scienceontheweb.net/absolute_power_novel.pdfIn PDF document text
    • https://bomekabekoz.weebly.com/uploads/1/3/4/8/134863976/lizigedovemigo-mesusebo-lanagoxov.pdfIn PDF document text
    • http://kilijosizujowo.medianewsonline.com/why_do_i_ejaculate_different_amounts.pdfIn PDF document text
    • http://xalapuzim.sportsontheweb.net/tixipomo.pdfIn PDF document text
    • https://wezusuruga.weebly.com/uploads/1/3/4/0/134096163/vokuj.pdfIn PDF document text
    • http://devumixik.iblogger.org/76284151763.pdfIn PDF document text
    • http://lisuzigerob.mygamesonline.org/behavioural_finance_by_prasanna_chandra.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388620/normal_600608ea8ffc1.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://xiniwipilanaju.atwebpages.com/administration_department_functions.pdfIn PDF document text
    • http://sanugifop.atwebpages.com/salvage_camaro_for_sale_in_texas.pdfIn PDF document text
    • http://jiwesiserej.epizy.com/dfd_for_online_banking_system.pdfIn PDF document text
    • http://jajeridusepit.rf.gd/sql_stored_procedure_interview_questions_and_answers.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/vufonodavowumexoben.pdfIn PDF document text
    • http://kobizesamow.rf.gd/amines_class_12_important_questions.pdfIn PDF document text
    • http://rusiwebo.epizy.com/58320338155.pdfIn PDF document text
    • http://satovimowenijor.myartsonline.com/jaxumabivabuzefarupesise.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_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 4644 bytes
SHA-256: 79c5342c9d8ca531b5346c3498186566f3c57a90cfb4bb5de74b84e87c174905
font_01_sfnt_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 10972 bytes
SHA-256: c363fcad448f0aee45a8bd1587cc7a8304e18c2db1fa99e81486fe056afe762b
font_02_sfnt_off000112fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FC 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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