Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6ccb50a7c88c39…

MALICIOUS

PDF

67.8 KB Created: 2021-02-21 13:03:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 2b2f316371f72d98f397436ee385ea7d SHA-1: ac584384618eebc7526726b6dd66d47fa8b20c8f SHA-256: db6ccb50a7c88c393e574de9eb33f6ace557d8f3711da2889e0829bcadabc4a2
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to known malicious redirectors or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were extracted, the heuristic firings and extensive URL list suggest the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=tyler+state+park+map In PDF document text
    • http://helpcopyright-service.com/pathfinder_performance_featsaaej5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483610/normal_5fd3b1efe721b.pdfIn PDF document text
    • http://igonlinesupport.com/54229357332uekqj.pdfIn PDF document text
    • http://nuveclovet.xyz/dietas_coreanas_para_bajar_de_pesojk4wy.pdfIn PDF document text
    • http://voseboler.iblogger.org/24895818575.pdfIn PDF document text
    • http://heretythere.site/254177930367sgs8.pdfIn PDF document text
    • http://feboxazatoran.22web.org/what_is_xie_xie.pdfIn PDF document text
    • http://onlyforyou.space/54841700190r2lm3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482191/normal_601138389dca6.pdfIn PDF document text
    • http://karnaval.host/wulexubitepu78utz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447270/normal_5fdda38fc9a02.pdfIn PDF document text
    • http://carluxepaint.site/kusetanfqlze.pdfIn PDF document text
    • http://purejup.iblogger.org/math_drills_reducing_fractions_answers.pdfIn PDF document text
    • http://gayerkan.com/2258363048g9mw0.pdfIn PDF document text
    • http://sokolov.fun/crossover_behringer_cx2310_manualh02tq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/ruravisafidol.pdfIn PDF document text
    • http://likijanima.epizy.com/b._a_pass_full_movie_free_480p.pdfIn PDF document text
    • http://xilagerezob.epizy.com/birla_public_school_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/88425449907.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC210 4604 bytes
SHA-256: 6d0637e03e11716b48ab2c423b97ef359993e1941b9eb055fb406b2e9d3242ea
font_01_sfnt_off0000d1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BA 10132 bytes
SHA-256: af9812ed1956eb2ee68cb2988981867dd2507e047cab5f4b6a4bffd0974d6d6c
font_02_sfnt_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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