Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4f0b8b228eea55…

MALICIOUS

PDF

86.4 KB Created: 2021-03-18 22:34:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b3900e4146bd860b4c7078d919eb8cc1 SHA-1: 0846fa8b1d4d9164d54df00284b4b60ff17ffbfe SHA-256: 8f4f0b8b228eea55780b6b26de24f74f236a658e99dc4eec11c8c16060faf6a6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. The presence of external URIs and the overall structure point towards a spearphishing attachment, likely leading to a malicious website or further payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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/award?keyword=aetna+medicare+drug+formulary+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/lojibuwe/iiLjj8Z/yahoo_messenger_chat_room_apk.pdfIn PDF document text
    • http://voicebftyi.com/kefodavi6erjt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410443/normal_5ff1833861a24.pdfIn PDF document text
    • http://healthit.space/ninawofovifuzdl5yj.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/86184783844.pdfIn PDF document text
    • https://gabudusufixojur.weebly.com/uploads/1/3/5/3/135339303/pabugesaxesubi-didomotamelor-merebu.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/murottal_al_kahf_mishary_rashidfi034.pdfIn PDF document text
    • http://domobifotuza.sportsontheweb.net/barron_s_sat_subject_test_physics_free.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/28697044056.pdfIn PDF document text
    • https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/fufixaviziruser.pdfIn PDF document text
    • http://vumexovuvelafe.medianewsonline.com/50278908375.pdfIn PDF document text
    • https://nejalebemenogun.weebly.com/uploads/1/3/1/0/131070187/d50c7a856dde409.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/drawing_books_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzexesetaba/gfFQhb7/administracion_de_recursos_humanos_definicion.pdfIn PDF document text
    • https://kajubuti.weebly.com/uploads/1/3/2/6/132680994/4830099.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/burgerking_coupons_august_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/vRjb1SM/ziruse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410986/normal_604833177092f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467926/normal_5ffe71fef27d2.pdfIn PDF document text
    • https://cdn.sqhk.co/seruribemoju/emggehi/alkene_reaction_summary_sheet.pdfIn PDF document text
    • http://instapriz24.online/what_statement_best_describes_the_message_of_the_political_cartoonmp22i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491445/normal_6022e8c19bc78.pdfIn PDF document text
    • https://zekufizow.weebly.com/uploads/1/3/0/7/130775694/50f09dc629cf9d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465565/normal_5fd23f02b7c25.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/Cm9rgfN/vexepuzexaperubezopafitaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vobozezojip.onlinewebshop.net/55241805022.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 5664 bytes
SHA-256: e2519f3a4d62c99d334dd5722adc72ab57730c8f8dff37eba38981b46c0dfc06
font_01_sfnt_off00010dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFC 11684 bytes
SHA-256: 676b7bf97747faf852d7366bd2f0e207d865b093533b25438c4f5bf035c678ce
font_02_sfnt_off00013601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13601 16232 bytes
SHA-256: 0865ea5686e30d19842a941efae749c2e92da649021023aa876fc32c67f43dd0