Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6757073477b001…

MALICIOUS

PDF

75.6 KB Created: 2021-05-02 20:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ae5f12d406b492930f63439006b01d17 SHA-1: 261ee1133ad81d8fe0cfb030efb4bba5cd399ee3 SHA-256: 8f6757073477b001d28427b48efcb7e81f585132a005ba09e8c363784b4128b8
126 Risk Score

Malware Insights

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

The file is a PDF containing multiple embedded URLs, with one identified as a potential phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, suggesting malicious intent. ClamAV detection and ML classification further support its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=the+shining+carpet+pattern PDF link annotation
    • http://bexukavinawexov.mygamesonline.org/aquatic_ecosystem_notes.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/pegodizolaf.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/artrosis_de_hombro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491969/normal_606d9b1623815.pdfIn PDF document text
    • http://tubujefowabe.medianewsonline.com/strength_of_materials_formulas_for_civil_engineering.pdfIn PDF document text
    • http://rejawulomov.mywebcommunity.org/96115861209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_604b469706aff.pdfIn PDF document text
    • http://rubolanir.mypressonline.com/guwosazade.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/awaken_the_giant_within_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447436/normal_600ecb370591f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee3ed7d-3e03-457f-bfde-b05f513e0e9a/netgear_ac1750_wifi_cable_modem_router_model_c6300.pdfIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_2779f02c56ad4dcc84badd4eaf4107bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/austin_j._1962._how_to_do_things_with_words._oxford_oxford_university_press.pdfIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_7f8fcde72ff846b9b5db0f7e9c27965c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/gumefupo.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/gluconato_de_clcio_bula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d50a9dd6-3d9d-49d3-9ef6-c9a963c6493e/sebanabepawifupegen.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_d1c42226d3f648599c293e74923b2907.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/rupepuxizutojifawoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf736ba5-7245-4343-90ee-c63da658bf1a/86528700479.pdfIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_7441c5c291b444e89b9793b011ebefc2.pdf?index=trueIn PDF document text
    • http://sogurorirerew.onlinewebshop.net/kigamafam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fec65662-1603-4fa9-9f8d-b320115369a9/can_zip_codes_be_4_digits.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/sibopobosedinafozubobo.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_off0000ec3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 5112 bytes
SHA-256: 3e14b826ff58b7d9d2d5074e876f632f0101ddd1a1dc7c93b75e1ce712cc7912
font_01_sfnt_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 10536 bytes
SHA-256: 228bdb4af11fb33b50882cbbaa296a33616c6761c9f5d85c624dd678d1a840a8