Malicious PDF — malware analysis report

Static analysis result for SHA-256 789753277837ed57…

MALICIOUS

PDF

76.9 KB Created: 2021-03-15 23:27:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a098310142ff4931beab421acadc6096 SHA-1: c9231b8d4636da1e851725e9ae604094f314d588 SHA-256: 789753277837ed5754ae416b8e8dd1348cc9e9b0023293faff74a845cedac8bc
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 0.9991

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://midufefew.ru/award?keyword=essential+fatty+acids+pdf PDF link annotation
    • http://amsidgi.xyz/centurylink_remote_access_call_forwardingcilbl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392474/normal_6005902e53c36.pdfIn PDF document text
    • http://alexsaf.ru/anna_niccol_ammanitisxx36.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/mibikivipi.pdfIn PDF document text
    • https://cdn.sqhk.co/bopibege/vijQjet/potexusi.pdfIn PDF document text
    • http://dixagodal.iblogger.org/qualities_of_a_good_science_teacher.pdfIn PDF document text
    • https://cdn.sqhk.co/forinabam/agjM0Af/zekunupoguta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_603d06a30baba.pdfIn PDF document text
    • http://1s.london/nafuzubowejuxuxonipojenagnhsp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476432/normal_5ff8872f83c0b.pdfIn PDF document text
    • http://fastdonwload.space/what_books_should_i_read_to_prepare_for_medical_school4rw9o.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/daliwoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401972/normal_60387dd27f8fd.pdfIn PDF document text
    • https://cdn.sqhk.co/madilaxetevo/eohciiW/cally_s_caves_4_robins_vest.pdfIn PDF document text
    • http://xixosifa.22web.org/15615170062.pdfIn PDF document text
    • http://dijuvilojo.22web.org/bevegofejewi.pdfIn PDF document text
    • https://cdn.sqhk.co/vapumojemov/bUjjfhb/19073852822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_5fda039db87c2.pdfIn PDF document text
    • http://muvirire.22web.org/internship_application_letter_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sajulugebimisu.myartsonline.com/vegiselanopepaloripov.pdfIn PDF document text
    • http://situxunekidini.epizy.com/vubibigodezolapopil.pdfIn PDF document text
    • http://bopatazemot.rf.gd/9926301896.pdfIn PDF document text
    • http://nimoxorud.epizy.com/8785446643.pdfIn PDF document text
    • http://volajigatume.epizy.com/22492765821.pdfIn PDF document text
    • http://rilasiwawizumo.rf.gd/academic_writing_style_guide.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_off0000f02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 5112 bytes
SHA-256: acd8b7ed8ba1a8060da745a95b00eb7cbc452bd6ae54d90ffc2ff805621237f1
font_01_sfnt_off000101bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 10676 bytes
SHA-256: 50369edfb880b7977dcdd3863b0e2a2f239cd7aa9027bae8dd829fc91f80766b

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