Malicious PDF — malware analysis report

Static analysis result for SHA-256 c928f55ac05c9d59…

MALICIOUS

PDF

93.1 KB Created: 2021-05-17 08:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4097502ed81ad75f1954c59df80d5322 SHA-1: 2dcc9af088509b2c8ab9fb43e710475d5ea11366 SHA-256: c928f55ac05c9d5986d814c7a9910c31b16420e1c2f78fabeed451096d99dbfb
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing lure for software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=descargar+imagen+iso+de+windows+7+ultimate+32+bits+booteable PDF link annotation
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/2652799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_603c1cc837a81.pdfIn PDF document text
    • http://dugarudewemudo.sportsontheweb.net/bagada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481168/normal_5ff1dbf7a6bec.pdfIn PDF document text
    • http://kutejovanog.getenjoyment.net/are_you_there_god_it_s_me_margaret.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_60256ab4cb014.pdfIn PDF document text
    • https://lurabesuweki.weebly.com/uploads/1/3/4/5/134524451/rekabowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_603eb188e1780.pdfIn PDF document text
    • http://gugozefo.22web.org/anatomie_descriptive_du_tube_digestif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493597/normal_6068f4199432e.pdfIn PDF document text
    • http://xovijezup.mywebcommunity.org/jenkins_ldap_error_code_32_-_no_such_object.pdfIn PDF document text
    • http://wosutopanoba.mygamesonline.org/google_translate_indonesian_to_english.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://dupofax.rf.gd/99798108364.pdfIn PDF document text
    • http://valamujunitun.epizy.com/calories_in_long_john_silvers_chicken_planks.pdfIn PDF document text
    • http://rogidisili.rf.gd/98151787665.pdfIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_ec8c21e012b0442ab25ba0f9c878876a.pdf?index=trueIn PDF document text
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_76db3805fdbd40ed9222887255757727.pdf?index=trueIn PDF document text
    • http://zeroxezubanalil.onlinewebshop.net/poverty_reduction_strategies_in_south_africa.pdfIn PDF document text
    • http://zagofij.onlinewebshop.net/sbi_calendar_2020_20_download.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1A 5380 bytes
SHA-256: 9dd7e8644d8fc6aa58b08585968689f84f420d875ec2d73446192142ce1d0286
font_01_sfnt_off00011da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA5 5748 bytes
SHA-256: 7f1829d685435585a1f83da2c8d7eb9eac0e8a96c609cac30bf41fac14acc8a0
font_02_sfnt_off0001312f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312F 11776 bytes
SHA-256: 7f8af1d0e06f60921b637f834edfcc0b3c82bdcad655b27772ad068e9eb22948
font_03_sfnt_off000157b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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