Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2fe0121607f4be…

MALICIOUS

PDF

76.9 KB Created: 2021-09-21 03:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9b0da674665b7c8e99f3f4789c68ebbb SHA-1: 4891ec89d7c778d493c23e3d0678aa022de429ff SHA-256: bc2fe0121607f4be9aeb9816951dd8f29ab4a15d718a952f738a69163483d53a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that lead to a link farm, suggesting an attempt to direct users to download or access malicious content. The presence of multiple disposable hosting domains and UTM parameters further supports a phishing or potentially unwanted software distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wastran.ru/uplcv?utm_term=download+pixel+car+racer+mod+apk PDF link annotation
    • http://zhouzhuank.com/v15/Upload/file/20219172245134031.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/kawikodiw.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98827763518.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/duzib.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/nifikadigemigigujokuretun.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/wodilevarojan.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/43406745587.pdfIn PDF document text
    • https://stotex.rs/files/15834655697.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/50060061054.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/sagedakinisarenige.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/82047848187.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/rimugavidujigibope.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/835b4707c72efecebf99ba482dbe8307/49458440194.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/49149180743.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/99546518406.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/doxinurukef.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/7029874218.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/48758899646.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/jipalazizefika.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/93341309831.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_off0000c8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F3 17340 bytes
SHA-256: 7f01c18c3f384100e5f77b39c569bf59b4f1acedb0c80579861e4c7ebaa5fc80
font_01_sfnt_off0000f5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F9 10688 bytes
SHA-256: be58c654f33891d91c9fd9a5f3c85f9518d7fd2b9412adcc695ea8e66382139d
font_02_sfnt_off00010e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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