Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b28c01901b3d1bc…

MALICIOUS

PDF

74.2 KB Created: 2021-03-08 01:24:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b2318f08be0e8c168e6a2d089a12741f SHA-1: 7c0962d58725ea0ba4280c328134f8f3449983f8 SHA-256: 7b28c01901b3d1bcaeb00a62c85cd4a2269525afadd8c7bdf99838cdbe66c003
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary URL, https://soxebez.ru/wix?keyword=bass+fretboard+notes+5+string, is likely part of a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/wix?keyword=bass+fretboard+notes+5+string PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481513/normal_601dd1caf2e77.pdfIn PDF document text
    • https://mawovajexajadow.weebly.com/uploads/1/3/0/8/130874262/19d957a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414357/normal_5fecc0659a1f2.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/rakuzanitobigut.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/ea9159fe-9f2b-489c-bbc4-274716b3821f/how_to_do_big_7_division.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/785035b7-6206-4024-8728-93f8067acf4c/72322839452.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/23040243638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a5877b4-b701-4d90-b9f6-309d63daaa2d/machine_learning_for_algorithmic_trading_bots_with_python_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/77577110070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a427075-f1fa-4527-a93b-a9c0c81f05fe/dd_tomb_of_annihilation_characters.pdfIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_5f15b64b1f694c56a527eeec0cd870ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a5d9bb-8322-4742-bb7a-a0b99adf86d7/asus_rog_maximus_vii_hero_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a108f6d-424d-479a-baa2-7701555e442a/nejuvivojuwabuxubejumeka.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/zezobowelopev.pdfIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_50605b1bd101473d8885e9402d35e7b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8760ac26-e220-4fa3-b4eb-f1ad75483274/dc_circuit_analysis_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/573b1063-57cb-4293-8b96-3c7ede5a0cba/57410446181.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/oxford_advanced_learner_s_dictionary_online.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_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 5356 bytes
SHA-256: 73e399bc33d9b59d5d87bce069e6eb7be4d3ed461cbda26cbc08206197c66d53
font_01_sfnt_off0000f8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 10260 bytes
SHA-256: 682f5e3562dc6ed9f77620eb8c47824d8df23233e1d12686dc7b19faab326cf4