Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d64921fd26048b…

MALICIOUS

PDF

80.1 KB Created: 2021-03-30 20:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 48e5a9e86abe2af5b558466e3510268b SHA-1: 23a5a9e0a90bfde96e31bd480683d33037bd174c SHA-256: 81d64921fd26048b57e0f856b42b53551859c77cabd358134fa5a7a9d7f2811c
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection for phishing and trojan activity. The embedded URL `https://jumiwimov.ru/123?utm_term=can%2527+t+connect+to+wifi+android+tablet` suggests a lure related to Wi-Fi connectivity issues, likely directing users to a malicious site. No scripts were extracted, but the PDF structure and URL are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jumiwimov.ru/123?utm_term=can%2527+t+connect+to+wifi+android+tablet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470027/normal_5fde6647168c8.pdfIn PDF document text
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/sudira.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_602aa6b96ce87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450509/normal_5fdbbaf88a441.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403541/normal_5fddfa1d8da5b.pdfIn PDF document text
    • https://dasubafetimediz.weebly.com/uploads/1/3/4/6/134673415/tixiwok.pdfIn PDF document text
    • https://kajubuti.weebly.com/uploads/1/3/2/6/132680994/fojumus-kazekapijodojo-japaxanelize-wefukodomil.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/43c70b2b-6e83-41fb-ae71-33e810d8ec9d/lopamekogogufabuxutofuxi.pdfIn PDF document text
    • http://jolurula.epizy.com/ponotaruder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0130a7-5c72-4f18-9941-1e8b8ffa744e/how_does_into_the_wild_movie_end.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/zikiroverefugika.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/13715403296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b0e2ea-acdd-4880-bd4c-64acbd27e093/xarivajowunol.pdfIn PDF document text
    • http://fesifudojepaj.epizy.com/xamokiwemovezefomipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d06db7c-d138-49e2-b5af-40e983e680ee/zatasoz.pdfIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_050344784bc3436ebd8c664a36bb47e5.pdf?index=trueIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_593b0306fa904eca8d33a1198a1cda7d.pdf?index=trueIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_c0fe510573994f36a5285ab1e0862c07.pdf?index=trueIn PDF document text
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_63ca9bc4269144bfa83c91cdc40094eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/tiger_rice_cooker_jbv-10cu_costco.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/padi_rescue_diver_exam_answers_version_a.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/64456110430.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_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 5008 bytes
SHA-256: 25e12dfbede33576fb9a5a55275c1a222724dafd5e78cad17c4682c1857fd1a2
font_01_sfnt_off00010d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D95 10988 bytes
SHA-256: 167466923f3ce6c5f8abaa710506f5a8672e7f232ab5c99ae71f9126df297182