Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c67ea6906236d2…

MALICIOUS

PDF

75.8 KB Created: 2021-02-27 02:56:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c8e09941a19cf0f515bdd7a4432eb61d SHA-1: 6cf6d240921f11ad22786830d077aa79d9dbfa60 SHA-256: 58c67ea6906236d2c24e4589bf7c039990a9ac4fcd52b6f8c938028ee0c1e94e
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a disposable hosting domain and another to a URL with a suspicious query parameter, indicating a likely attempt to lure users to malicious sites. No scripts were extracted, but the presence of external URIs and the overall detection suggest a phishing or malware distribution vector.

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://nipisod.ru/wix?keyword=ann+arbor+crossfit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419194/normal_600d9d76d51e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501789/normal_60295e94a3449.pdfIn PDF document text
    • http://dazenad.iblogger.org/jotolunepulepo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480582/normal_5fcb7039a881b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488822/normal_5ffb087026776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426822/normal_6013e3077610d.pdfIn PDF document text
    • http://nozidogevuze.22web.org/deep_value_investing_strategy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488817/normal_5fd881a21a0ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450256/normal_6022bc597cd05.pdfIn PDF document text
    • https://nogetutiru.weebly.com/uploads/1/3/4/7/134711470/0b0a3d009d5c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://reboronunupofit.epizy.com/craftsman_dls_3500_original_price.pdfIn PDF document text
    • http://juvugakor.rf.gd/cules_son_los_sntomas_de_abstinencia.pdfIn PDF document text
    • http://xidijunuv.rf.gd/gas_chromatography_ppt.pdfIn PDF document text
    • http://zutadefado.epizy.com/career_development_plan_format.pdfIn PDF document text
    • http://fefezaw.rf.gd/how_to_create_attendance_sheet_in_excel.pdfIn PDF document text
    • http://wegefidipa.epizy.com/astro_a20_xbox_one_setup.pdfIn PDF document text
    • http://lelekon.epizy.com/52869976386.pdfIn PDF document text
    • http://najaxobefirag.epizy.com/dcfs_mandated_reporter_form.pdfIn PDF document text
    • http://gafawazela.epizy.com/9940106000.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_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 4972 bytes
SHA-256: 5b039e856e323964a0f6e37e835b9ed79017b597e2c11fdceeafbf179e42793e
font_01_sfnt_off0000fc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 11200 bytes
SHA-256: 946968a1a1e87e63c30d3ae4b7a433879f46603b3209b64fa1a9efd5469b5b9d

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