Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc7cff81af309e3…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 22:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a823dad2c887304f424302b8f885e5e SHA-1: 78beafada04fd044a243e23f891dc66ff4b21601 SHA-256: dfc7cff81af309e36e12db0698c56cc967bb84fc9a0a04357b41492c92785e66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, and heuristic analysis indicates it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a T1566.001 (Spearphishing Attachment) attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://5of7edwardstreet.com/assets/media/files/26001495039.pdf In PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/66521808866.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/jokojavozofasuwemafubutaw.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/38766750399.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/16275271600.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/naguzobivamavefiso.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/33848536457.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/jawejekipozuzaxawij.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/nebutupanamujetiworovafex.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/mepefoka.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202197057475046.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/86639742056.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/98196874875.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/nezub.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/33309375238.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/ruxuvokemilopidife.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/39103303809.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/gunasikoro.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210908_134818.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16141aa618828a---razepoxomi.pdfIn PDF document text
    • https://kildevangen.dk/files/saroripevoweremadojaxo.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/dafolekota.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/bobiwakemudiliz.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/duwapulomiwil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=after+we+collided+full+movie+free+online+putlockerPDF 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_off0000d559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD559 17272 bytes
SHA-256: 5e75be7e994dcb9582bbc7be5756ea1e1499d3a3c44a1e912a47bf089926e0ab
font_01_sfnt_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 10776 bytes
SHA-256: c3cd0b7197e10795c59e11adb452836500c5265edf28daab4f998d924d3bad5e
font_02_sfnt_off00011a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1