Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b7b026e262cf29…

MALICIOUS

PDF

78.5 KB Created: 2021-03-01 04:07:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f0945290861c06b397505cad093ce53e SHA-1: 8a44681d7ba94ec21f3713a21851d9118b0adbe9 SHA-256: 23b7b026e262cf29d220214cd6475dfe4ae7b338c39006f62f59147d9dbc385b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. Although no scripts were explicitly extracted, the nature of the embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' suggest a phishing or trojan delivery mechanism.

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://resalured.ru/award?keyword=american+society+of+anesthesiologists+score PDF link annotation
    • https://nuduxojobiri.weebly.com/uploads/1/3/4/6/134629521/4113323.pdfIn PDF document text
    • https://jewinovezuxumat.weebly.com/uploads/1/3/1/4/131407424/wedawifezawexeko.pdfIn PDF document text
    • https://nulivuxod.weebly.com/uploads/1/3/0/7/130776854/f5e421.pdfIn PDF document text
    • https://jarofipe.weebly.com/uploads/1/3/1/4/131408229/5227952.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/984016200.pdfIn PDF document text
    • http://nibelv.xyz/redline_drifting_script_pastebingsqgs.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/what_does_the_placement_of_beauty_marks_mean.pdfIn PDF document text
    • https://pafuxasakilufa.weebly.com/uploads/1/3/5/3/135327400/4068e4ba620e45.pdfIn PDF document text
    • http://magic-world.site/pujajotezibarujokutu2suk.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/negaxipamati_xupevo.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/annie_broadway_musical_original_cast.pdfIn PDF document text
    • https://danawojigu.weebly.com/uploads/1/3/1/4/131407111/8553761.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/menidonepod.pdfIn PDF document text
    • http://joy-todays.online/goxokavi9v17c.pdfIn PDF document text
    • https://rujizubag.weebly.com/uploads/1/3/0/7/130776042/wakisezepigi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liroporuki.myartsonline.com/aircare_humidifier_error_code_ec.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/72779055815.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/blueant_supertooth_11_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/21455246761.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_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 5388 bytes
SHA-256: 9efef8ba4fffa9beda13cb9052502c4acbf83997fbc0a77a6315d41f369ffc29
font_01_sfnt_off00010a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A24 10064 bytes
SHA-256: 9d56fea65a89de64cec4275ad3e90227355bf8ef14f465474da0e994f81e70da

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