Malicious PDF — malware analysis report

Static analysis result for SHA-256 309d5999d3a46ba1…

MALICIOUS

PDF

80.8 KB Created: 2021-03-31 15:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c401ff00220c77b28003419fa26e7564 SHA-1: a4e6fa543373fa3c023f94cfe751acb801bf733a SHA-256: 309d5999d3a46ba1fec85b29ca45007f925b2f49542df998659bf940131e4b61
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=cara+membuat+cv+menarik+di+android PDF link annotation
    • https://wopufibirebosaw.weebly.com/uploads/1/3/4/4/134466277/1d89692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392444/normal_5fd2ce48ccc2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457862/normal_5ffcf0c51b948.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/ljfjehw/81211038332.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/Cjh8YID/consolidated_theatres_pearlridge_showtimes.pdfIn PDF document text
    • https://nadebexipopajin.weebly.com/uploads/1/3/4/6/134678264/4396704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449599/normal_605ee528a9e62.pdfIn PDF document text
    • https://vazewelekataba.weebly.com/uploads/1/3/1/6/131606588/nuxeboko_foganidukub_wuluzefibimag_subisamalivip.pdfIn PDF document text
    • http://vasakuso.sportsontheweb.net/kegovesureseludusubeli.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/mhc4djb/xanomekawoforiposegomipo.pdfIn PDF document text
    • http://vepenuvix.mygamesonline.org/how_do_you_fix_a_black_screen_on_a_hitachi_tv.pdfIn PDF document text
    • https://bolefusugo.weebly.com/uploads/1/3/4/8/134868203/6608129.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415534/normal_602707886d427.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://matewedidoxeber.onlinewebshop.net/74283135563.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/8962103725.pdfIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_01853b5994bb4e74bc9d75d451eba85e.pdf?index=trueIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_4362520481cb4d70bca79d43224ce1f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/best_paid_android_email_app_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/demand_supply_and_market_equilibrium_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/27316301478.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_f5d22cf51c8b4aa081835c614a659161.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_off0000fed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED0 5044 bytes
SHA-256: 516fc31e3190a9f2f0ff87ff3c8c79a6e4dcda7101dc38dee895f47104949456
font_01_sfnt_off00010fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE4 11132 bytes
SHA-256: 505163a867158a875eb9559c55cbd92ce4f17d5593b5f954f5d877136f8c9f5a