Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab07efa57f33250…

MALICIOUS

PDF

75.4 KB Created: 2021-01-18 19:02:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1b85073facf061528d333b6f4528dbff SHA-1: 96486cad0d1c3b13c9478e80e72d18b1fd839a60 SHA-256: 4ab07efa57f332500d809bd81631f0e69f788d87ee697000c803de857aa2959c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to obscure the final malicious destination. The document body, though truncated, presents a deceptive lure related to academic work, likely to trick users into clicking the embedded links.

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://traffset.ru/aws?utm_term=work+cited+page+for+book+report PDF link annotation
    • https://site-1173456.mozfiles.com/files/1173456/tovilamipof.pdfIn PDF document text
    • https://site-1180550.mozfiles.com/files/1180550/sipepetapubovebitopatu.pdfIn PDF document text
    • https://site-1168267.mozfiles.com/files/1168267/38447558335.pdfIn PDF document text
    • http://fokefetebebinin.66ghz.com/kathmandu_plane_crash_report.pdfIn PDF document text
    • https://site-1178643.mozfiles.com/files/1178643/57613212521.pdfIn PDF document text
    • https://site-1173612.mozfiles.com/files/1173612/sales_team_management_software_free.pdfIn PDF document text
    • https://xexewajadet.weebly.com/uploads/1/3/4/6/134651298/22f762f57f9.pdfIn PDF document text
    • http://rabisoluvilava.iblogger.org/columbia_shuttle_disaster_report.pdfIn PDF document text
    • https://site-1177754.mozfiles.com/files/1177754/2107.pdfIn PDF document text
    • https://site-1176481.mozfiles.com/files/1176481/41728338504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369777/normal_5f91960b45532.pdfIn PDF document text
    • https://penopetidurip.weebly.com/uploads/1/3/2/8/132815040/4299540.pdfIn PDF document text
    • https://mujiborabasovu.weebly.com/uploads/1/3/4/5/134590634/numerafo.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/295c920.pdfIn PDF document text
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/d54f4d96cedca1.pdfIn PDF document text
    • http://pirawamajakemiv.22web.org/pegeduwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wojixefem.epizy.com/kekaxugeziziniso.pdfIn PDF document text
    • http://wemubivoparuf.epizy.com/andriette_norman_songs.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_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 5328 bytes
SHA-256: fe0bc22f0b63e34a7bad8f527bf0c1c02b7014b585459c696daf785da9e43841
font_01_sfnt_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 12120 bytes
SHA-256: 757db713a7735d79f24c3d1350a4a7248a93653ffd8e27e72d6a9f9705f8ec2c

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