Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63f8313ec9700d7…

MALICIOUS

PDF

74.5 KB Created: 2021-03-22 11:46:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5deb85f15a5033205d0659b4563bee5d SHA-1: cc58709c2c38681343c9fe1de806bb0d63911e20 SHA-256: b63f8313ec9700d7c83d6632a62fd9896b6cc7d0fd2e4eb1cd334f918ebadc70
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=a+hotmail+kaydol PDF link annotation
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/a2daecd7e9.pdfIn PDF document text
    • https://sekugarotapoze.weebly.com/uploads/1/3/4/3/134362520/a4b8adda8.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/zLNjaje/lost_lands_hidden_object_games.pdfIn PDF document text
    • https://cdn.sqhk.co/xanuramalu/eiaDiis/ikea_furniture_hacks_buzzfeed.pdfIn PDF document text
    • https://cdn.sqhk.co/legezuseg/fifBha9/417_namahana_street.pdfIn PDF document text
    • https://cdn.sqhk.co/soxosovave/j4HB0PV/34346399173.pdfIn PDF document text
    • https://cdn.sqhk.co/sugefixa/BCicjja/fluid_wallpaper_iphone_xr_hd.pdfIn PDF document text
    • https://vojizozovogimum.weebly.com/uploads/1/3/0/7/130740342/dukobufawu_xejopo_pafifetuwolub.pdfIn PDF document text
    • http://pefuwujoxuroj.iblogger.org/sql_format_number_without_commas.pdfIn PDF document text
    • https://jemidezegin.weebly.com/uploads/1/3/0/8/130874295/sugew_tunibej.pdfIn PDF document text
    • https://zujituxo.weebly.com/uploads/1/3/2/6/132681889/togakevunavor.pdfIn PDF document text
    • https://cdn.sqhk.co/nugilatunu/eicjcgd/19657318429.pdfIn PDF document text
    • https://nofemifi.weebly.com/uploads/1/3/2/7/132710694/pebefuwetudevo-famopufidonafux-jevavafe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vedixemalirugi.atwebpages.com/how_to_read_the_serial_number_on_a_briggs_and_stratton_engine.pdfIn PDF document text
    • http://japamitafixe.myartsonline.com/haier_hlp21n_belt.pdfIn PDF document text
    • http://kikanelomer.onlinewebshop.net/nursing_management_of_typhoid_fever.pdfIn PDF document text
    • http://gavojomizam.epizy.com/my_aged_care_assessment_manual_march_2018.pdfIn PDF document text
    • http://fokawen.rf.gd/93068858588.pdfIn PDF document text
    • http://gedonisezif.epizy.com/zudiseginuxizefamiga.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_off0000e82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82C 4944 bytes
SHA-256: def2adab6a95e5ddd1237bf4de48394e7c4db86b99ebfc60d8379de5261f497d
font_01_sfnt_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 10596 bytes
SHA-256: c8cb058a10b996ddb7a6a297f5dc3df58ea4d7a31adfb4036eacdcd623c15968

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