Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b08b93dcc2f1d3…

MALICIOUS

PDF

74.6 KB Created: 2021-05-18 18:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3258a516631a6bbb30a8923b6e8503c1 SHA-1: 04fbe35187d328ad791e02e8f6eb43ff720da117 SHA-256: 84b08b93dcc2f1d393e75d1b7466cc5aaa30371ad8efd9e76bd4054206b0321c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and one prominent URL includes a 'utm_term' parameter suggesting a phishing lure related to a 'construction geometry program'. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly indicate an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=programme+de+construction+g%25C3%25A9om%25C3%25A9trie+cm2 PDF link annotation
    • https://zinuwikisabarek.weebly.com/uploads/1/3/4/6/134679236/nokir-xudit.pdfIn PDF document text
    • http://bilapak.66ghz.com/kumiruba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_601be82bb52f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_5fd7a1c0a662a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447436/normal_603ad7110c492.pdfIn PDF document text
    • https://kerobasoxegetun.weebly.com/uploads/1/3/4/0/134017970/ce9add80b2a6.pdfIn PDF document text
    • https://fenatafu.weebly.com/uploads/1/3/1/6/131637570/nudemuzeworimuwusi.pdfIn PDF document text
    • https://zigibopujomez.weebly.com/uploads/1/3/5/3/135350997/saxowulewe-guvigapibokep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469633/normal_6062d758417a0.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/dd577d17-944f-4829-a7cc-98cde4fff838/ideas_for_icebreakers_for_virtual_meetings.pdfIn PDF document text
    • http://bulagim.epizy.com/92396820539.pdfIn PDF document text
    • http://xugobenive.epizy.com/transformers_nemesis_prime_wikipedia.pdfIn PDF document text
    • http://rajifuxoral.epizy.com/urticaria_cronica_tratamiento.pdfIn PDF document text
    • http://zimunumiwu.epizy.com/focusrite_scarlett_2i4_drivers_windows_7_64_bit.pdfIn PDF document text
    • http://walazej.rf.gd/wozejerajepegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b6420ab-91f9-497c-b7d1-540eb5fac833/probability_statistics_and_random_processes_for_engineers_stark.pdfIn PDF document text
    • http://wufizijutema.rf.gd/kikuwu.pdfIn PDF document text
    • http://tafinefonekon.rf.gd/addams_family_comics.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_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 5500 bytes
SHA-256: d9cad513aac5c7f546a58f912db093e43650dd9e6e8b12a3f80a441919d99f43
font_01_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 11532 bytes
SHA-256: 256c6e26ba3b2c193229dcad98a010cdd1c009e9f55b60f77fb69d6bf150f856

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