Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfc369b90c61f33…

MALICIOUS

PDF

72.3 KB Created: 2021-03-20 10:59:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 70aa184ce88ca520a3aa3f37ff40598f SHA-1: b18a089957bfcf5b2052c225a4fc1d85d8b5513d SHA-256: fcfc369b90c61f33662ffbe4b9bc07d0ea8ace7986260e17d48c4ca4405bb2e1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'dilutions worksheet', hinting at a lure for users seeking specific content.

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://druttle.ru/wix?keyword=dilutions+worksheet+w329 PDF link annotation
    • http://goromeo.club/20671359400ypsmw.pdfIn PDF document text
    • http://neuroncraft.online/59505628692ekd3l.pdfIn PDF document text
    • http://apsdd54gfv.xyz/77543985393otlyq.pdfIn PDF document text
    • http://teksalle.xyz/fajafokapaxegesijeqsrhy.pdfIn PDF document text
    • http://reweder.site/923785990689waxa.pdfIn PDF document text
    • http://guitar.su/qiaquick_gel_extraction_kit_manualcd05i.pdfIn PDF document text
    • http://fbcopyright-center.com/quadratic_interpolation_method_in_optimization12hvz.pdfIn PDF document text
    • http://idealicait.website/basic_trigonometry_formulas_sin_cos_tanrtei0.pdfIn PDF document text
    • http://amorexpo.com/html_css_javascript_interview_questionsf7ali.pdfIn PDF document text
    • http://losinglotterynumbers.com/titulo_de_credito_hipotecario_negociable_power_pointg35qh.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/jutatifabobesibidoxpm4w4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suxanovovogemi.rf.gd/bronchopulmonary_segments_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c1a3b52-5896-42a3-81bd-97088b8c8419/torelawufureduruwulutiwiz.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_812d8dacd8b04f5981fec137f91ae70b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2420f28-46f5-43e5-aa68-d4e35447f4b8/67499244479.pdfIn PDF document text
    • http://medesawawolujim.epizy.com/fortisiem_appliance_datasheet.pdfIn PDF document text
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_d95910b3fd544dd4a60131c3a7aa4781.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_a18eedbc0d2d4f649bac5d719da3e564.pdf?index=trueIn PDF document text
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_4f5304891d4c4334ad0788c29c82efcc.pdf?index=trueIn 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_off0000de09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE09 5168 bytes
SHA-256: a018fa54ba4af83d5d5e1022755e015e65b4ea9242291abb9a4490a4d9d3e7a0
font_01_sfnt_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 10672 bytes
SHA-256: 7169e36cf8f72bb6d79859c81453daa500b17772281fa883afd254a0bc5b1a5e

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