Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d35560cdf85fb66…

MALICIOUS

PDF

77.0 KB Created: 2021-03-06 23:34:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4e479d5669a20aaeb90bd2403ef2344b SHA-1: 26a3036185650ba6a0b160af6b4203e2f922bb7d SHA-256: 4d35560cdf85fb6690835922b0b001f9a8e9afcc773b7df616a244861dbf7f2a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=how+to+fix+e1+error+on+air+conditioner PDF link annotation
    • https://cdn.sqhk.co/gesafafo/jBRjaib/how_to_draw_gacha_studio_eyes.pdfIn PDF document text
    • https://cdn.sqhk.co/kodivitedi/iohfoji/47499799522.pdfIn PDF document text
    • http://xenalebosob.scienceontheweb.net/60132455840.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/bICGBKM/80_s_hard_rock_songs_top_100.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/ihjEjd7/cosmology_meaning_astronomy.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/cZcZjfS/sifapezogedudenagasujaga.pdfIn PDF document text
    • http://mibebar.22web.org/formel_areal_af_trekant.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/GlhcLhg/applock_pro_cool_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/TjhgghU/notomunakakimadonid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481072/normal_602f00f418630.pdfIn PDF document text
    • https://cdn.sqhk.co/ritapabinap/LgiDjFV/dipagomisabiboziruvab.pdfIn PDF document text
    • http://lawexape.mygamesonline.org/46450754125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382408/normal_6023d07e522db.pdfIn PDF document text
    • https://cdn.sqhk.co/jukelifawap/cjeF3ie/16960828200.pdfIn PDF document text
    • http://fibisazorowax.mypressonline.com/58630206063.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xologikaju.atwebpages.com/losazulidiwelemum.pdfIn PDF document text
    • http://kixixiwibatogit.epizy.com/ruzirulugakar.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/74028005479.pdfIn PDF document text
    • http://biwodonugawodil.rf.gd/pukudugelegofekataworix.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/invoice_form_template.pdfIn PDF document text
    • http://kufuravolej.rf.gd/voltage_and_current_transformer_difference.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/18762901323.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/megevokupixuxasikizore.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_off0000f20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 4980 bytes
SHA-256: 7ba56dda96e893bdf81637bfea694a3c1b323a6df15d364cc94f0d8867006aff
font_01_sfnt_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 10240 bytes
SHA-256: 300b61b667ecc696c8b52941b2087ab34b5e0c15f2ea17de0e8d97b01e967880

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