Malicious PDF — malware analysis report

Static analysis result for SHA-256 b791acc447c4bbc8…

MALICIOUS

PDF

119.4 KB Created: 2021-04-05 13:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d3f3db67b3c6fad038c296506d1d8f31 SHA-1: 7bdf7c56d664d25a8f1c6f3a22cf00c50be36ac3 SHA-256: b791acc447c4bbc8445be974dbcf21b07f44ce6c7bf1df0847c3b2e0993d3721
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to maps and technical applications, potentially used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kuzutuzo.ru/wix?keyword=tiber+river+maryland+map PDF link annotation
    • http://jigikujed.scienceontheweb.net/mcsa_certification_study_material.pdfIn PDF document text
    • https://ripumoravoramex.weebly.com/uploads/1/3/1/6/131606135/resofebomemi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_605044b75b90a.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/whirlpool_front_load_washer_error_code_f5_e2.pdfIn PDF document text
    • https://jazakeramexevam.weebly.com/uploads/1/3/4/6/134615015/jexixemekopapasele.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475730/normal_6051e59a3eb20.pdfIn PDF document text
    • http://jalojewaga.mypressonline.com/35713280438.pdfIn PDF document text
    • http://servempieza.site/girl_scout_cookies_strain_grow_guidekp5u7.pdfIn PDF document text
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/80355.pdfIn PDF document text
    • http://douchehq.xyz/nadupejeru32i6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5fcbf6f2a2716.pdfIn PDF document text
    • http://sitajejo.22web.org/41744152336.pdfIn PDF document text
    • https://zupuluduwiwafop.weebly.com/uploads/1/3/2/6/132681460/f189b707.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421039/normal_5ff685c0b311a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sojusubelifaf.epizy.com/wuxiwapiteluzatewelamotul.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/trasformazione_da_centesimale_a_sessagesimale.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/webster_english_spanish_dictionary_online.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/enthalpy_change_definitions_a_level_chemistry.pdfIn PDF document text
    • http://rowoniwetob.atwebpages.com/94382919924.pdfIn PDF document text
    • http://widadipadiv.epizy.com/performance_appraisal_research_paper.pdfIn PDF document text
    • http://nomapalugaji.epizy.com/82271191829.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/how_to_make_a_foster_child_feel_loved.pdfIn PDF document text
    • http://nuwumunis.epizy.com/37869223657.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_off000185bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185BC 3240 bytes
SHA-256: e360bab89e6e6ca5c94add2b4b431c4e9108a13001a52a2a189d859537f5c3f6
font_01_sfnt_off00019154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19154 5176 bytes
SHA-256: 857318e7bc04a67249899db7e1e5e6c4f0755de25a4897f9f60a51da51b86b63
font_02_sfnt_off0001a2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2DE 14244 bytes
SHA-256: bc6d225205c98ceea845f52ec7344d3d6875c720a56ee33fbb6a07f42d024395