Malicious PDF — malware analysis report

Static analysis result for SHA-256 b943082364a4da6a…

MALICIOUS

PDF

86.3 KB Created: 2021-04-04 18:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6d4e93c5d8054573f333a845441ca317 SHA-1: 50a99e598cbb1a5d6477e9d3d553997da27e1479 SHA-256: b943082364a4da6a56bb4e4d3777d598e6e355fbda6734c06c9e535adf2ad6c8
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it is a link farm designed to redirect users. The primary URL, 'https://jumiwimov.ru/award?keyword=alzheimer+signos+y+sintomas+pdf', suggests a lure related to Alzheimer's symptoms, likely to trick users into visiting a malicious site. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/award?keyword=alzheimer+signos+y+sintomas+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443372/normal_60188d4ace167.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455642/normal_60059b65ee3cf.pdfIn PDF document text
    • https://gokidobizivoji.weebly.com/uploads/1/3/4/4/134495246/875942.pdfIn PDF document text
    • https://jalidinetuvumun.weebly.com/uploads/1/3/5/3/135333814/d3864b886e8dce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371791/normal_6036dd6ae9288.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/xivuvit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409604/normal_602a1fa372c1b.pdfIn PDF document text
    • https://japapitamamevoj.weebly.com/uploads/1/3/2/7/132740309/6112202.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416665/normal_5feb0c8820474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392861/normal_6038fef7d57b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/6th_pay_commission_report.pdfIn PDF document text
    • http://merapenerabari.myartsonline.com/nixuvozoxegadumewu.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/67290448149.pdfIn PDF document text
    • http://ladurabazidema.onlinewebshop.net/vojodamawaginalu.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/1487504290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93bf6e45-8c67-4589-9478-cd2ef9273a51/different_types_of_figurative_language_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e8b6b0-1f21-4342-ba51-bab2945461f1/rock_cycle_worksheet_8th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/vagelejaw.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_off000112c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 5596 bytes
SHA-256: aa9e5f48ba769f4c32776c2aa3c832f0127050444f717da5d087617856672c4f
font_01_sfnt_off000125ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AE 11400 bytes
SHA-256: d762c9ac3c8d60810d15327f082f2a29f1923eb304926693578ce4b491fd5dcf

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