Malicious PDF — malware analysis report

Static analysis result for SHA-256 857ae59246ea7576…

MALICIOUS

PDF

73.1 KB Created: 2021-09-28 05:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e4560d2bee27077a801c820197ad3d3d SHA-1: 98537c4826ba615565ab9e5ff1c9e8bb91b9a8f9 SHA-256: 857ae59246ea75766797078895a4f6c892730074ca7cbf76e46231a5a4f71698
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document may be designed to trick users into calling a fraudulent support number. No scripts were extracted, but the presence of many external links points towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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 https://medvor.ru/uplcv?utm_term=lirik+lagu+ariana+grande+into+you PDF link annotation
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98747374766.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109021104253734.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/javibijotikipipuz.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/keguxudasalunerofisalas.pdfIn PDF document text
    • http://korio-olsztyn.pl/userfiles/file/2451911753.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/74965227898.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/63973821085.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/pijazitavezigibu.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/jixavisefifekazene.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/98035532689.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72493336881.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/zovumikoxas.pdfIn PDF document text
    • http://laserinnsbruck.com/static/98959698302.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/lotevurevewotokulabirid.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/60571060716.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/wilozisezemoxugoroxelog.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/60564910483.pdfIn PDF document text
    • http://espwireless.net/uploads/file/31782735027.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/86873572413.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/90328427405.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140e571c15b1---vozizolilufezas.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/bezejilol.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5691119be347520e7267c3bd876f477a/safuvejoruneranojir.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_off0000b971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB971 17656 bytes
SHA-256: f3463c4c40137004880ed6d87defb29ef9ab4d74884f7290eaea40cb0e9282db
font_01_sfnt_off0000e742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 10520 bytes
SHA-256: 7502b78d710b5b4b7c3694b44554dea8c9e7e0e376b9cea1bc1c97fb4d07ab4f