Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3edada8dfa9061a…

MALICIOUS

PDF

69.8 KB Created: 2021-09-12 13:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: be2497aabe5f184fb5aa696a1796504c SHA-1: c37a9353fbf2d60b410ccdc987f98b293c08919e SHA-256: b3edada8dfa9061abe3bb476b2c7bd023566f28b19764febaa5e54bf66b05bf1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of `utm_term` parameters in some URLs indicates a phishing or spam campaign.

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://inwebjor.ru/uplcv?utm_term=how+to+send+pictures+from+iphone+to+android+via+text PDF link annotation
    • http://taispacedesign.com/upload/files/43633552154.pdfIn PDF document text
    • http://sql110.com/pic/10724543003.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d795e38c9---3622134163.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/12572016442.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/62406424586.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/78035610985.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/zijejufosisaxiranixoniru.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/47422506846.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/nakolozi.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/91508954994.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/sipabinaterovan.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349700942d3---19818825651.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/77483012284.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/77807387111.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/69244074590.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/jigokemivasibikiluru.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/gorip.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/lesepeka.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/49752801659.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/16087160505.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB027 11184 bytes
SHA-256: 00d599cee6de21e2a65d8bce5797660c876f509be2fff910d60a02d5e8d8d85b
font_01_sfnt_off0000ca2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2B 15464 bytes
SHA-256: 5eacf0af67fc21ea64cf08e51b81de5249b492fbb00a3299985a7acc897e0cf7
font_02_sfnt_off0000f154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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