Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9260156c4ca49af…

MALICIOUS

PDF

83.6 KB Created: 2021-05-10 03:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4d28febf6d864a25a3e7c6fe8024f0cf SHA-1: 00ee94b918de2b0744002203a584c1289aec50c6 SHA-256: c9260156c4ca49af28e0a3832f5c586cd7cd5cbf273c7d2850c51f02bad774fb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious sites, including one that appears to be a lure for 'dewalt d55146 parts manual'. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/strik?utm_term=dewalt+d55146+parts+manual PDF link annotation
    • http://xtreme-sport.ru/norton_anthology_of_english_literature_volume_2_9th_edition4x3v9.pdfIn PDF document text
    • http://mapumuvovabukux.22web.org/halo_effect_marketing.pdfIn PDF document text
    • http://ganoget.scienceontheweb.net/batevubinekogajamuze.pdfIn PDF document text
    • http://zuxekagapefe.mygamesonline.org/canon_canonet_ql17_giii_film_camera.pdfIn PDF document text
    • http://soxisit.22web.org/microsoft_excel_course_outline.pdfIn PDF document text
    • http://lalabomujulimof.mywebcommunity.org/tecnologie_applicate_ai_materiali_e_ai_processi_produttivi_2.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/timesazu.pdfIn PDF document text
    • http://virivuluk.getenjoyment.net/contrapunto_primera_especie.pdfIn PDF document text
    • http://axacheat4.xyz/como_es_el_pase_elite_de_noviembre_2020z05y1.pdfIn PDF document text
    • http://agent-spv.space/punawilewolu8bj6f.pdfIn PDF document text
    • http://golosa-spasibo.ru/game_dev_tycoon_android_strategytei6n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ligekasuxube.onlinewebshop.net/93755507950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4f0ba7-b732-43d9-a4d3-e478548547f9/introduction_to_heat_transfer_john_wiley.pdfIn PDF document text
    • http://nureresew.epizy.com/jegemuvobegaxanoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6b5f6c3-156a-4eb9-af9c-02b96fe6bf49/kexirezewolawaret.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/fewul.pdfIn PDF document text
    • http://sabixukavizom.myartsonline.com/bhagavad_gita_yatharoop_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcaa2dfa-ca10-4420-a903-a9033f14220a/nuzetudizusunulerob.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/family_therapy_questions.pdfIn PDF document text
    • http://nopawalaxuwaw.onlinewebshop.net/naming_molecular_compounds_worksheet_answers_chemistry_if8766.pdfIn PDF document text
    • http://widepidaba.atwebpages.com/ultrasound_anatomy_of_lower_limb_muscles.pdfIn PDF document text
    • http://belibivizonojo.myartsonline.com/mufodixuleboxilunarinuvul.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 6440 bytes
SHA-256: 705377623a4c4344e02470fedf876d1ed6f0c7c0eac322cafb15afc9430d14bf
font_01_sfnt_off00010518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10518 5616 bytes
SHA-256: ee56a8517416fc2233714c8a38b9672fd4fbd35aec5fa79cda9ca05ea7183093
font_02_sfnt_off00011840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11840 11800 bytes
SHA-256: 2fe73305676823bbb0c0e6e86ea1c651119c1458ebed66bb50136e75440c92d4