Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b2ae594d234482…

MALICIOUS

PDF

73.9 KB Created: 2021-09-19 13:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f59967595f6c9147fadacf241d6214d8 SHA-1: 94d8b70031ede9e0fa5e2d6b3ede6fd73b606e79 SHA-256: e0b2ae594d234482410eb11002bbea0b1196d0f0e17831f2bcff56c049085716
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it is a link farm and a callback phishing lure, suggesting the document's purpose is to trick users into calling a fraudulent support number. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ucokampen.com/media/files/99524971660.pdf In PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/tunefibosenof.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/99780288878.pdfIn PDF document text
    • https://vientangluc.com/upload/files/venesuvelujakap.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/betekadukedorox.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/22652112987.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/f6ff930c66155b4126bceff9d0648f67/dukujesalidonifi.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/16006620308.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/56209748536.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///68378530944.pdfIn PDF document text
    • https://andrejc.si/files/file/vavuvejisevomenaxor.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/77400442410.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/lusilije.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/kuwewizugemazuzo.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/karamopuzijuvapisi.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/figorukigaborabopeniwi.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/77349479289.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/jarodime.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/88577401815.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/62817045180.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/fufixotej.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8e4d954a5---pivikaxibat.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/tunebiv.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/15582433088.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/16227529572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+i+delete+search+history+on+my+androidPDF 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_off0000bca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA8 17424 bytes
SHA-256: c9a63e4c473fc3db68b13b0078b3168058feec24c15753f1857b20fbb73cdc87
font_01_sfnt_off0000e930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10147 10828 bytes
SHA-256: 55ba40f321324a462336e06979f3a2b7e0e23608bd8851d7f0fa15909d8eded0