Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45055e353244741…

MALICIOUS

PDF

79.9 KB Created: 2021-03-18 06:57:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b9277c3e278e7df4b385df3e4ce04480 SHA-1: bae984790a4ff8c9b443a9e13ecba5b423a7b192 SHA-256: e45055e353244741ce2871683577dbec496fc08a732eff77a8d0a5b019c21525
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a notable one pointing to 'bologen.ru', suggesting a phishing or redirection attempt. The PDF structure and embedded content, though heavily obfuscated, are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bologen.ru/123?utm_term=appraisal+answers+weaknesses PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366647/normal_600b6667882b7.pdfIn PDF document text
    • http://xevedudox.sportsontheweb.net/87155504495.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449616/normal_5fe234a2f384e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447433/normal_5fd34fdcdb6e3.pdfIn PDF document text
    • http://nibofope.66ghz.com/acer_aspire_v5_571p_wifi_driver.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/descriptive_adjectives_worksheet_grade_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411683/normal_6012674a27a9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5fdfb72e26224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474719/normal_6042c1ed29f61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421209/normal_5ffe610f176eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424331/normal_60262530a94b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_048d35aa95af48c0997e3b9ca2335962.pdf?index=trueIn PDF document text
    • http://tamedigozetot.epizy.com/gugagufa.pdfIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_c0b4c640bc22412ca37ead6e90fceea1.pdf?index=trueIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_8ade6fbe97784da896e8cedfd5f25d44.pdf?index=trueIn PDF document text
    • http://palakojum.rf.gd/famajodapiluvalofoj.pdfIn PDF document text
    • https://e2a12503-e9f4-4898-9b1e-00959bf5a9c8.filesusr.com/ugd/1f0de7_855de8a8ef1f4e039efff3834cba520f.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_43a7e4f5d48c4f12a547afd21c3f4d42.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_d486ce5f90324fa296960d98057ede83.pdf?index=trueIn PDF document text
    • http://sanugifop.atwebpages.com/malformation_de_la_charnire_cervico_occipitale.pdfIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_f358bfad63ce40aa8bf2c8d7de6bff5f.pdf?index=trueIn PDF document text
    • http://pekiluji.atwebpages.com/31982001298.pdfIn PDF document text
    • http://pimibini.epizy.com/sony_vegas_package_effects_free.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_off0000fc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8E 4956 bytes
SHA-256: 40c24dd4356165ac00a3f0ab4097087173bca90dbcd2ed1e351d7472390fe9c1
font_01_sfnt_off00010d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 10768 bytes
SHA-256: 9724fe45277973f4002b58cb7286634b05a9548d475ac0174e0284a296b87059