Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a17a3f3efde71b…

MALICIOUS

PDF

80.5 KB Created: 2021-04-14 04:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4f0cb809900fbd0125d9835a00abdbf6 SHA-1: c5eabe422bab74bbda381277dc52375c22b3a13d SHA-256: 16a17a3f3efde71b894f8a751cd05bf161977fe5ff7c8d0295438fcbd049ac52
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or scam operation. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially corrupted, contains text related to salary information, likely a lure to encourage clicks on the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://dafemum.ru/strik?utm_term=how+much+does+an+educational+psychologist+earn+in+ireland PDF link annotation
    • http://zapitexidij.mypressonline.com/william_tell_overture_piano_sheet_music.pdfIn PDF document text
    • http://zisapawiwako.mypressonline.com/chain_of_custody_evidence.pdfIn PDF document text
    • http://fisurigata.22web.org/4893132670.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/rososatomoxusamawugob.pdfIn PDF document text
    • http://generalmassage.online/9126484443fstgl.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/pajovorafopomij.pdfIn PDF document text
    • http://xonejalevesezom.sportsontheweb.net/law_firm_management.pdfIn PDF document text
    • http://midesamipazizuj.scienceontheweb.net/convertir_de_a_word_ocr_gratis.pdfIn PDF document text
    • http://dexowowijovovu.iblogger.org/fly_away_violin_sheet_music.pdfIn PDF document text
    • http://lg-supportteam.com/95318242962szq5f.pdfIn PDF document text
    • http://setovewurepenu.22web.org/kalyani_steel_annual_report_2019.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://budibisila.epizy.com/convert_to_word_online2pdf.pdfIn PDF document text
    • http://ruxomipeb.epizy.com/search_by_image_apk4fun.pdfIn PDF document text
    • https://1d20f49f-ccd6-4d05-b9af-9ecc574be1a3.filesusr.com/ugd/7b50d7_eed6de5d63054c69acd7106266dd5d02.pdf?index=trueIn PDF document text
    • http://tizeruxabono.onlinewebshop.net/inorganic_chemistry_pw_atkins_download.pdfIn PDF document text
    • http://bavajusap.rf.gd/ldc_answer_key_2020_utkarsh.pdfIn PDF document text
    • http://wexoloxi.rf.gd/sovugilikavefegebes.pdfIn PDF document text
    • http://lidizuderezoza.rf.gd/89432143733.pdfIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_57b36f66b430446e9cb6b182ad8adc8a.pdf?index=trueIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_a12e836c86c44c0592f7f0a6ee836dae.pdf?index=trueIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_48d8e502432a46f6a333471be42d41fe.pdf?index=trueIn PDF document text
    • http://feferabi.atwebpages.com/zisomemu.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_off0000ec25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 5524 bytes
SHA-256: 6767056c5dc3572a000fdb7c5b85986ba5728031b356f5db9183bf1d4d06a9c0
font_01_sfnt_off0000fed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED8 11504 bytes
SHA-256: 59449ad595d4200e6a9b10460c3a4a4a50cb84e23b4945cb41ca4fac38be611c
font_02_sfnt_off000125f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F4 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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