Malicious PDF — malware analysis report

Static analysis result for SHA-256 502707182012117a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 14:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1306ae6604c9ec0a4e17862a9a927b69 SHA-1: 3e9c07a8f5ff29a9fe56e6789377cdcd385d9038 SHA-256: 502707182012117ac448a509f584a4af4226c16d3fb76ef82165f8828a46589f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URLs, many pointing to disposable hosting, and the 'SE_CALLBACK_LURE' heuristic indicate a phishing attempt. The document body, though heavily obfuscated, is consistent with lures designed to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://inwebjor.ru/uplcv?utm_term=what+is+rilnotifier+app PDF link annotation
    • http://cafesezony.ru/fck_editor_files/files/58045675362.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/sunexok.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143eafdcbbae---13779736269.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631955947.pdfIn PDF document text
    • http://mylodge-naoshima.com/80225805908.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/watifafepigagi.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16132231a34dc5---zemimobivafubakaterun.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/94885848088.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/lajujagupex.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/dumowujefus.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/rolep.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/49762891264.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/22721004345.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/sibusomamimivijomekomokis.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/bivebixedojuweg.pdfIn PDF document text
    • http://rhondachem.com/d/files/pivobegogimofotalaxujobu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c993a4c0f---pujojude.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/xigototitipolagexa.pdfIn PDF document text
    • http://lukinserv.hu/file/tudiduxiwetevuwujozekuj.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/gobazonobik.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/dutoxajiwu.pdfIn PDF document text
    • http://kaies.net/upfiles/file/98485722762.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/5063390436.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/vegodusef.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_off0000df0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0E 17596 bytes
SHA-256: 8b4235456459d28b9ef5ce0b387b5553a9f34628e54acefcfbf40a894fcec826
font_01_sfnt_off00010c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 10448 bytes
SHA-256: f7e41c73e94fcbfe2467744cb1f9ec861d94f0194a6533db63216ab7c943eb69
font_02_sfnt_off00012419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1