Malicious PDF — malware analysis report

Static analysis result for SHA-256 0438a6313345ffa8…

MALICIOUS

PDF

81.8 KB Created: 2021-04-15 17:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83afefd3c879a03b0012e7ad1a8bb447 SHA-1: 73cfe514aaabada6d961bb450d09374d078a6db3 SHA-256: 0438a6313345ffa8cb4bbeb66c9b16567b614161e638361b5b54403e6a7dbea5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to Weebly and S3-hosted PDF files, suggesting a link farm or SEO poisoning attempt. The primary URL, 'https://jumiwimov.ru/strik?utm_term=how+to+do+neck+workouts', is presented as a search result, aiming to trick users into clicking through to potentially malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=how+to+do+neck+workouts
    • https://xixasoxi.weebly.com/uploads/1/3/5/3/135324484/9071933.pdf
    • https://mopotiwifatuge.weebly.com/uploads/1/3/0/8/130813373/votasizimos.pdf
    • https://kuboteradaragi.weebly.com/uploads/1/3/1/4/131482952/3816271.pdf
    • https://sejukato.weebly.com/uploads/1/3/4/0/134018084/nafoto_xojizip_xovilisav.pdf
    • https://xevujudibibabus.weebly.com/uploads/1/3/4/5/134599482/c1087da3b6cb8.pdf
    • https://static.s123-cdn-static.com/uploads/4374979/normal_5fe158e269bf2.pdf
    • https://cdn-cms.f-static.net/uploads/4377098/normal_6066e6bb648d5.pdf
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/nekubeburujobibuv.pdf
    • https://guwidavimup.weebly.com/uploads/1/3/4/8/134893931/fd3ace86.pdf
    • https://buzoraxuv.weebly.com/uploads/1/3/4/3/134366179/2c763.pdf
    • https://cdn-cms.f-static.net/uploads/4459794/normal_602e0fbeeda59.pdf
    • https://vajalumodo.weebly.com/uploads/1/3/4/3/134390135/mozaxupimiwonof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zemigiduwagafu/bipexo.pdf
    • https://s3.amazonaws.com/borokegujuzero/song_chori_chori_by_kulbir_jhinjer.pdf
    • https://s3.amazonaws.com/xezujuxoz/vivudofirafaje.pdf
    • https://s3.amazonaws.com/tiluwisulepam/1414477583.pdf
    • https://s3.amazonaws.com/lijopavexanuse/8731756262.pdf
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_de9043bbcd194e9381759e8d0b89aec7.pdf?index=true
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_30d6c5a1402e418ab5c7468192bd89d2.pdf?index=true
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_c730361e015b4152a8bdccde84c5a45a.pdf?index=true
    • https://s3.amazonaws.com/dalava/6917053975.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010451.bin
1bd5d52f4abdb70d195996fd5e8417fa011dae024c5d4e81759c2c9167215a3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10451 4808 bytes
font_01_sfnt_off000114d1.bin
a9118a34cf98325353ca8e883270819c37e3014c8d245eea4dfda1f93a0c351e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114D1 10876 bytes

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