Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4bf1c5c1a0fe97…

MALICIOUS

PDF

109.7 KB Created: 2021-03-02 10:05:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b9abc7c66f1afee2f56054f109f19cee SHA-1: b0812405d081afd65fec7b71e7abe0f8c5ee3cca SHA-256: aa4bf1c5c1a0fe97c6afc31b95f0b90eadc058ae4c9da930c61a8c71901d978b
146 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://dugedepap.ru/123?utm_term=panasonic+lumix+dc-fz2000+ii+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404299/normal_602090e9dee8d.pdfIn PDF document text
    • http://zozagemidifisep.22web.org/two_point_hospital_strategy_guide.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/pokaseduxafubarapawa.pdfIn PDF document text
    • http://zazerabila.iblogger.org/barish_song_yaariyan_movie.pdfIn PDF document text
    • http://warupipujamoru.sportsontheweb.net/dell_latitude_e7450_price_in_pakistan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413125/normal_603892629bf35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466411/normal_6032f505a9618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414866/normal_603b4c33f1593.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nakeviw.myartsonline.com/45591406713.pdfIn PDF document text
    • http://satikemapobivix.epizy.com/4251570105.pdfIn PDF document text
    • http://diwisowaf.rf.gd/64354414997.pdfIn PDF document text
    • http://rabelinowizufe.myartsonline.com/18174341676.pdfIn PDF document text
    • http://jaxunukologefis.onlinewebshop.net/playstation_vita_psn_store.pdfIn PDF document text
    • http://xobeminal.atwebpages.com/81261053634.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_off0001704a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1704A 5744 bytes
SHA-256: 0c833fcc9a95e463c40bcc4db7846497e00a9c3732e72e695bb2b0f41273c96b
font_01_sfnt_off000183e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183E4 11312 bytes
SHA-256: accd6407e4267c124c44cb9bbdc5980431e61a7828e3c6b31f103f7fbc8d45a4

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