Malicious PDF — malware analysis report

Static analysis result for SHA-256 db271563429a3999…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 06:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fa8956952df74b6766ae6e6d3bc15286 SHA-1: ad411befb1ef603da8f57bc30aac4e8a7b2e8f31 SHA-256: db271563429a399966f0e5d471469e1109077a4037b32cde89d703eb87ec0b17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs and PDF structure suggest an attempt to redirect users to potentially malicious content or for SEO poisoning. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions.

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 http://inica.org/files/file///tizokimomubonepusiduxunim.pdf In PDF document text
    • https://100tmt.com/uploadimage/files/20210924154428.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/fuduwuwexo.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/3386705919.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/18267900903.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/lovatonusatuf.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/padabakoxiwutuka.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/kuzud.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/kuxabefuxere.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/74623117138.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea05fe0276---69294558151.pdfIn PDF document text
    • https://n-tlg.com/files/file/gasurodusidematidukonon.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/fizalizi.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/43193322623.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/7861753371.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/61595950371.pdfIn PDF document text
    • https://tele-video.ru/upload/files/munotexopelidegaj.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/tavezajusavizaluzi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/34147746074.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/10171051677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=after+full+movie+torrent+magnetPDF link annotation
    • 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_off0000ad40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD40 10536 bytes
SHA-256: 6fe55ac070eb87afb0f6982467b87a0343aca38d6478b12ebb525ca6072fb857
font_01_sfnt_off0000c546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC546 15072 bytes
SHA-256: 8cd69748828d7c22a38ab71135cc9c9bf3c1b79ae6dc41c518a5bb7c6b072256
font_02_sfnt_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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