Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32bf78968862a53…

MALICIOUS

PDF

74.5 KB Created: 2021-03-07 06:58:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e6be4993b73559d79c74244600691f40 SHA-1: 398e091d17e1b3665d463b8d0c83628480f9651c SHA-256: b32bf78968862a53619008a96d37141b1e5049a80932e688a58a3a043b4586b4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware or phish users. The primary URL, 'https://nipisod.ru/strik?utm_term=how+to+clear+memory+on+omron+blood+pressure+monitor+bp786', appears to be a redirector for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/strik?utm_term=how+to+clear+memory+on+omron+blood+pressure+monitor+bp786 PDF link annotation
    • https://tefafovok.weebly.com/uploads/1/3/4/5/134588422/be90b65b.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/conflict_management_skills_assessment.pdfIn PDF document text
    • http://figejewumoposes.getenjoyment.net/basic_mechanical_engineering_download.pdfIn PDF document text
    • http://diluzadumavotux.getenjoyment.net/vowoxoxudigigalijegewoga.pdfIn PDF document text
    • https://rodedewosesuge.weebly.com/uploads/1/3/6/0/136010241/7769155.pdfIn PDF document text
    • https://zekasujiminog.weebly.com/uploads/1/3/4/3/134366003/4fa6fa66c7b7.pdfIn PDF document text
    • https://tezefidusipenu.weebly.com/uploads/1/3/1/8/131857758/2205295.pdfIn PDF document text
    • http://miribut.mywebcommunity.org/sole_f80_weight_capacity.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://teluroluxeterez.myartsonline.com/todos_los_conectores_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/901e5feb-6a66-4732-8e10-dd556c25e4f9/59165455758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b9f84a9-ccde-4e76-905f-cca35671cc17/difurosodatopibasozujuro.pdfIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_68dd7e12070a4c78a5f49dc915da6a69.pdf?index=trueIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_5ed6d802203541f0a25dc9580d09df27.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b26c12b5-a610-44d7-a3cc-60070f52ee05/85633198214.pdfIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_1f2594ff7e3b4e34ab0cd15f9d692ef1.pdf?index=trueIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_cd2a3b0ed709435b83798b7fd6e280a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b4bf399-e6d8-4fc6-a8d1-be08b62fb93b/best_drawing_books_for_beginners_reddit.pdfIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_9a3f8207e5fe430992dae6ab2d4cd717.pdf?index=trueIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_38e563a0f2f348c9b03740bc7c951df1.pdf?index=trueIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_61e0173dfe524741b1b31b98a1d949c8.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_9ea19347dbc849faa2f27436ec06585b.pdf?index=trueIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_ddd373fb04244b33a0543216a184c4c0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 5944 bytes
SHA-256: 2f7e78c1e7e481a3eb4560f87c7432b6d2fdc72ed609dde1fc1224fd9717d10e
font_01_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 10820 bytes
SHA-256: 852f3d3139731702198547f52ed65fce1902236cc7b6d1859ca3a0d4ff17f15e

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