Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9ff36575b8fc48…

MALICIOUS

PDF

85.6 KB Created: 2021-04-24 00:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 19e775d63044769115adfc3db19fb5c8 SHA-1: 59eedae6b2313936d3dbd1cb9290f04e83a675e6 SHA-256: 0a9ff36575b8fc48801f95447dae56d6e32e6196bdd5fdc9e57beba64c56ea52
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://nipisod.ru/strik?utm_term=que+come+un+oso+polar+en+minecraft PDF link annotation
    • http://paxezimusosesa.scienceontheweb.net/alternator_regulator_test.pdfIn PDF document text
    • http://cheapestshop.xyz/68031387296oggrd.pdfIn PDF document text
    • http://cheapestshop.xyz/python_2._7_14_64_bitu4osi.pdfIn PDF document text
    • http://shlifovka-pol.website/play_of_consciousness_by_swami_muktanandaqqs3m.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/zijamitepinon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465263/normal_60660b690db95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505102/normal_5ffc71293b65e.pdfIn PDF document text
    • http://dronextactical.xyz/informacion_exogena_alcaldia_de_bucaramanga_2019shcsr.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/33085432052.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://tewatag.medianewsonline.com/ginumaw.pdfIn PDF document text
    • http://ru-1.casa/what_is_the_biblical_meaning_of_603266ye.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://tubulufegufixo.rf.gd/green_bay_packers_schedule_2020_printable.pdfIn PDF document text
    • http://kanuximus.rf.gd/where_can_i_donate_my_old_clothes_in_mumbai.pdfIn PDF document text
    • http://vizomonuzujo.onlinewebshop.net/sociologie_de_la_sant_cours.pdfIn PDF document text
    • http://palelezugob.onlinewebshop.net/reglas_de_acentuacin_para_palabras_agudas_graves_esdrjulas_y_sobresdrjulas.pdfIn PDF document text
    • http://muvamubas.atwebpages.com/pseudomembranous_colitis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 5104 bytes
SHA-256: bd484414992f2cd80b28c5f3ce9585aa00d1e2730763149b7b13114e3f440577
font_01_sfnt_off00011092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11092 12676 bytes
SHA-256: 863c4ab6fd696d602ba54bae525c6c6b4f1e46cba665dc983464b542135abe8e
font_02_sfnt_off0001399e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71