Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ec39a9bd7d960c…

MALICIOUS

PDF

86.7 KB Created: 2021-03-16 20:04:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d83515d9ffaa7a191ca89ecf38b5ed6c SHA-1: a9849b3e8510cbacc4671dfd7d391606a2da5d97 SHA-256: 26ec39a9bd7d960c5420c6b1d6b78473342de56680608c643d0318dcec0881ae
126 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 disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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://xezojetit.ru/award?keyword=genero+dramatico+caracteristicas+pdf PDF link annotation
    • http://navalny.design/58189304932nrhqj.pdfIn PDF document text
    • http://telemprom.xyz/netbeans_8._0_with_jdki56tq.pdfIn PDF document text
    • http://govazibibili.22web.org/77005871343.pdfIn PDF document text
    • http://zumasuxujole.22web.org/tanzania_catholic_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/jdKgjwn/the_triplets_of_belleville_watch_online.pdfIn PDF document text
    • http://mandarins.space/tap_building_umichcz26u.pdfIn PDF document text
    • https://cdn.sqhk.co/leguzufaju/beIBSpu/black_friday_tv_deals_walmart_canada.pdfIn PDF document text
    • http://liko-sneakers.com/lubarelasodedurqek9.pdfIn PDF document text
    • http://getveran.site/xerip7ety9.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/9510839454dobck.pdfIn PDF document text
    • http://robertferrell.net/xelujazowinutemulifefogeldrepa.pdfIn PDF document text
    • http://storeeuro.info/nogitumakelil1std5.pdfIn PDF document text
    • http://masajsalonunuz.com/95033599895su9dy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zukixewagiv.epizy.com/forming_storming_norming_performing_dorming_mourning.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/reaction_of_alkyl_halides_lab_report_conclusion.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/one_piece_dance_battle_apk_english.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/rafadiposevuzuxez.pdfIn PDF document text
    • http://lagiwugakit.rf.gd/47662181244.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_off00011248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11248 5300 bytes
SHA-256: 451e3246cd309baf6298ca651c7e856a285e800931cbac13ffe1653bccc4ed1b
font_01_sfnt_off0001243c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243C 12252 bytes
SHA-256: 83e98883d7bef14b944d0e8f7bec844f88983619c784ec68cc500ce15fde3c3c

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