Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c02491a60a0ca00…

MALICIOUS

PDF

83.7 KB Created: 2021-10-06 18:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c2e01036bce11c8a8954e1ba0fab41f4 SHA-1: 6d7fc8b9d178bcce3690332f00849c14880a2a73 SHA-256: 8c02491a60a0ca00734bccf9e3910a60e8da2d632b52e35ec5a546cdbbcc7f47
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://sunrise-photon.com/upfiles/editor/files/14346457838.pdf In PDF document text
    • https://griffithnorthsideapartments.com/ckfinder/userfiles/files/fudarila.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6acfeab4e---69648864794.pdfIn PDF document text
    • http://alfamar.travelshops.pl/userfiles/file/92036332136.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/mebedigimij.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/juzefovekox.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/domisapisinezuxok.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/nalotifitapitusuxuneta.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74270473574.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/45096989332.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/fuvabuvabiraw.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/86285706138.pdfIn PDF document text
    • http://ippon.lv/uploads/File/68959237607.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/velativefanuv.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/37656227846.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/kinipul.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/58504395774.pdfIn PDF document text
    • https://penal-garazh.ru/files/59682561978.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/xawuxuwodasarezomulazapo.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/40352230756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=search+warrant+examples+pdfPDF 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_off0000e33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 10936 bytes
SHA-256: d7e3708aba743619548e043249ef2b1a29d00c29333909da4e198157a6960e72
font_01_sfnt_off0000fc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11487 17548 bytes
SHA-256: 958fdbaca148844cafaf680464136700698f19fe11b37d8f7035a8f4bd46e11d

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