Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0155f0d8e8b7c8…

MALICIOUS

PDF

77.3 KB Created: 2021-04-27 04:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e7daa9c040bb35ce05b343c5d51cc34f SHA-1: 23a16f3f9859d6b9465bb18afa28251b08c56247 SHA-256: 3b0155f0d8e8b7c89f3e18a57359e4a6c9150e0f4a12306485731ac5a4a2587b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, references "Trigonometric identities problems for class 11" and includes application metadata, suggesting a lure to a malicious site.

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://resalured.ru/strik?utm_term=trigonometric+identities+problems+for+class+11 PDF link annotation
    • http://marafonsport.site/netgear_prosafe_plus_gs108e-300pesww0rn.pdfIn PDF document text
    • http://fixefakaxus.22web.org/patenedomimiwov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453537/normal_606d2c791cf49.pdfIn PDF document text
    • http://zodezabazigojab.iblogger.org/49432839810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480899/normal_605dfd8f46872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_6025cf8342255.pdfIn PDF document text
    • http://profapp.pro/pearson_grade_4_math_workbook7dki6.pdfIn PDF document text
    • http://tryplafond.xyz/73686397911kt0cn.pdfIn PDF document text
    • http://hookup754.fun/gmail._com_freed7d16.pdfIn PDF document text
    • http://pmaider.com/metro_map_delhi_latest_20193cka1.pdfIn PDF document text
    • http://vefipitop.22web.org/pexituxomo.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tulosa/wefesixuvefagapobulapeje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/194bd8d8-d997-4f6c-be37-2497c5fb68d7/xilibawop.pdfIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_f91a37d3b0f64f4aa3caebe9fa883803.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paropabaru/zoxefufevepif.pdfIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_0aed1e10c2054558a8d04737e3c4eec5.pdf?index=trueIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_c913bb2a0ae6477a97fcce0bb8d1dc39.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/419c3c6c-ef4f-4131-bba5-bbbc1331d3c9/what_provisions_did_the_mexican_constitution_of_1917_include.pdfIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_07039c7a4c3f4f15b2f6336a51bc2935.pdf?index=trueIn PDF document text
    • http://joliwudetikuzu.epizy.com/binding_of_isaac_platinum_god_cheat_sheet.pdfIn PDF document text
    • http://dibawuleseba.rf.gd/kagod.pdfIn PDF document text
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_46ab418ba6a64402b97e4cd043e5cd37.pdf?index=trueIn 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_off0000e0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E6 2264 bytes
SHA-256: c3fe19e3e0b6bb4cbc4d4a60ad820ab55163666cc9d2c0572a59e3c8d34df3fd
font_01_sfnt_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 5616 bytes
SHA-256: 292cc11c129aeda48a93f566625c2c86450a9f388992921fd850b27a0c95fa7d
font_02_sfnt_off0000fe37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE37 11868 bytes
SHA-256: 3e80a88a609529438428a8a0c120dcacdda0224898108535fde991ca9e9ab49e