Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28e44b3d4e47378…

MALICIOUS

PDF

66.4 KB Created: 2021-03-04 02:52:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c02710f0237a980a88fa69e5ce85d47a SHA-1: 5c26ba6b976c001ab49dbfb5798a1bd6b5eb328d SHA-256: f28e44b3d4e47378e640a0bab1a0a10ed5b693dfba849be1463c3b453d2f55d8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites like 'baarspo.ru' or 'jonebukusopovet.mygamesonline.org'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wix?keyword=cookie+crumbs+in+the+rolls PDF link annotation
    • http://jonebukusopovet.mygamesonline.org/the_mouses_tale.pdfIn PDF document text
    • https://gelupolo.weebly.com/uploads/1/3/5/3/135314506/6135264.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/new_yorker_student_subscription_tote.pdfIn PDF document text
    • https://fiferogupinuwa.weebly.com/uploads/1/3/5/3/135306016/0c0de311ad2.pdfIn PDF document text
    • https://cdn.sqhk.co/giwumazusew/VjeaJiz/9476846805.pdfIn PDF document text
    • https://cdn.sqhk.co/giripiponi/ejjHjjc/super_fancy_pants_adventure_100_save_game.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/haghIhe/metal_soldiers_2_apk_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/filomada/gfgjXFy/nika_riots_constantinople_532.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/hahy4f2/neurologist_near_me.pdfIn PDF document text
    • https://fofifiso.weebly.com/uploads/1/3/4/6/134613093/puvovunujef_veletuvo_riwugo.pdfIn PDF document text
    • https://cdn.sqhk.co/fumediju/55ic0gi/83611527213.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gifesikubelazu.epizy.com/86322277882.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/sepinotupoxunuxoriwobo.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/checksur._exe_windows_7_32bit.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/hotstar_premium_hack_apk_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/weather_report_charlton_ma.pdfIn PDF document text
    • http://rofuvawitarul.atwebpages.com/serial_de_oro_windows_8.1_single_language.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_off0000c7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AA 4936 bytes
SHA-256: 413529ecbcf12fb94bb55c234db2134958a1c3dd308576ecc4af836830a69a43
font_01_sfnt_off0000d849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD849 10208 bytes
SHA-256: 5dd9ca3ab4311d59654e78733d06ef5b73b82f86677eb347486561366d019947

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