Malicious PDF — malware analysis report

Static analysis result for SHA-256 d814bba1340f864f…

MALICIOUS

PDF

78.6 KB Created: 2021-03-18 09:55:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: fe801279217637501da1123fe5f024b5 SHA-1: 33ed41adf3b577da3bbb5974e53e5a7b36e84aa0 SHA-256: d814bba1340f864f506bf328e4d6b9cb961069160bd415efec01ae0d7ebc738d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL, 'https://seumenha.ru/strik?utm_term=which+bible+verse+talks+about+time+for+everything', is designed to mimic a search result, likely to trick users into clicking it. ClamAV and ML classifiers have identified this PDF as malicious, specifically as a phishing or trojan variant.

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
  • 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://seumenha.ru/strik?utm_term=which+bible+verse+talks+about+time+for+everything PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369323/normal_6011387cef4c7.pdfIn PDF document text
    • http://jitutirujemi.22web.org/pre_retirement_planning.pdfIn PDF document text
    • http://motorutovibipe.sportsontheweb.net/what_does_cultural_diversity_mean_to_you.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407804/normal_5fc9194604ad6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_6023f43bc8c35.pdfIn PDF document text
    • https://luvabuzizav.weebly.com/uploads/1/3/5/2/135294148/rorivabowijok.pdfIn PDF document text
    • https://wajuzetixageg.weebly.com/uploads/1/3/0/9/130969085/xobuvovoripuje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490739/normal_6012d730e3e3f.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/how_many_classification_of_antibiotics_are_there.pdfIn PDF document text
    • http://laribij.scienceontheweb.net/define_human_development_index.pdfIn PDF document text
    • https://revotifolalowo.weebly.com/uploads/1/3/4/7/134716495/dufoxajetikizaxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tifuwonojize.epizy.com/tujutasekevagipinatogobe.pdfIn PDF document text
    • http://bepafazo.epizy.com/2011993952.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/chave_de_produto_windows_8.1_pro_32_bits.pdfIn PDF document text
    • http://nividibewejoba.rf.gd/jozobulatabexexoponofu.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/facebook_icon_free_android.pdfIn PDF document text
    • http://xeregolipota.epizy.com/hirdaramani_group_annual_report_2017.pdfIn PDF document text
    • http://fotiworoz.epizy.com/lifomedilubenamato.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_off0000f531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 5672 bytes
SHA-256: b18e031a8782e2ab080dc35407b1412fcf1fb414244e644858b00a3ad2e327bb
font_01_sfnt_off00010872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10872 10792 bytes
SHA-256: c7c340692731a90e94ff4d0645df486cf10f8f396936a779efbca77f78fb5792

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