Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b18513bb5b1d535…

MALICIOUS

PDF

80.1 KB Created: 2021-09-23 16:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1803126126afe6619b42a7a72a7f1fba SHA-1: 2c4c059fd68c8813140cf95443fa60e6b0aa8049 SHA-256: 8b18513bb5b1d5356c9feee02dd3afdad21a6a188647f9e59ae41139d708e3e9
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and is flagged by multiple heuristics, including ML classification and ClamAV, as malicious and phishing-related. The presence of numerous disposable links and a link farm heuristic suggests an attempt to obscure the true malicious destination, likely for malware distribution or phishing. The document body is unreadable, but the heuristics and URLs indicate a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mcutech.net/upload/2021/09/file/16316972981666960637.pdf In PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/jogid.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140ff1c280b3---tenutudinamipaxuwidugapex.pdfIn PDF document text
    • http://fedime.org/imagenes/81258842321.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/fatepirelesemosezo.pdfIn PDF document text
    • http://le383.com/uploads/files/xulimanarakimaj.pdfIn PDF document text
    • https://projetovm.com/uploads/files/68501163543.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/zakojuw.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/polasiwikowewivu.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/bewitod.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/tetuwabavimazeza.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e5bd4dcff---39520343492.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/5879469772.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/wimemenigoxujonidifisiso.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/89014787287.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/xiwazifopajifimojate.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/jenelizubuvewoxema.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/tubeso.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/voxewadotodixojofelad.pdfIn PDF document text
    • https://laser123.com/geektic/files/50562908823.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/55978485143.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/lamujifosavidibik.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/98426993028.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/xutibunatitadoruxumejilo.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/41919464954.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/45680452125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=statics+and+mechanics+of+materials+solutions+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_off0000d0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A0 11060 bytes
SHA-256: acc09e57056933fe7047973f49c518a539f85ce7b7e59e4b323566228c03f35f
font_01_sfnt_off0000ea20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 18372 bytes
SHA-256: 15dab20ad8b5d1005def97f65337921cf16a1f0544689ac5ad93c087551d6611

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