Malicious PDF — malware analysis report

Static analysis result for SHA-256 5889a0e3eca725a4…

MALICIOUS

PDF

78.0 KB Created: 2021-03-20 02:12:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06c75eba9be20e247968bec63fa3c301 SHA-1: aaf701a1543063bcdce92a4444f12d7f5adfec21 SHA-256: 5889a0e3eca725a4144579cb047c8941d13593f36eccb46174f6ab0bab449e2b
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 functions as a link farm, containing numerous external URLs, with at least one pointing to zajinet.ru, suggesting it's designed to redirect users to potentially harmful content. The presence of multiple disposable hosting links further supports its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/award?keyword=dialysis+related+amyloidosis+pdf PDF link annotation
    • http://matawobedopikam.mywebcommunity.org/introduction_to_analysis_of_the_infinite_book_i.pdfIn PDF document text
    • https://sebexuvifezurob.weebly.com/uploads/1/3/4/8/134881690/tejijabebejejumosos.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/7f3b9.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/gjiiaKL/82530292256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_603a038a847a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407087/normal_602fdbd518e90.pdfIn PDF document text
    • https://cdn.sqhk.co/juzosugun/gec7fmr/vice_president_debate_2020_live.pdfIn PDF document text
    • https://betebawaxudu.weebly.com/uploads/1/3/5/3/135388356/a0f78493901.pdfIn PDF document text
    • https://rifusefabizavi.weebly.com/uploads/1/3/2/3/132303317/a35fb64fc.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/jgeIgc7/international_animal_days_2020_uk.pdfIn PDF document text
    • http://dojemop.mywebcommunity.org/fefexoruduxozezusunaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_744259e1692e4533b9c3d14420dee980.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_09b4223bda1541aaa604675cc68ea226.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ed5a5c-0aec-49fc-adf8-d0e1fd301a24/kemelugogufabisipevanase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b89066-0a27-4f66-b204-06baf0c21bc9/the_woman_in_the_window_movie_date.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/garmin_gps_76_user_manual.pdfIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_e93d7e06e87a4bda8159c4f9411464a6.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_off0000f3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 5288 bytes
SHA-256: 83ec764708fa393e6ed66be760f2ba72aa603692152f68443efb13379198db0a
font_01_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 11284 bytes
SHA-256: 6277a05c6d1a99d7a06ceedfe6ab8a300047b7bbab0b118f1560658fd8220dc1

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