Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98424fb7c873a3d…

MALICIOUS

PDF

74.2 KB Created: 2021-09-23 12:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 936916a68bb7e5afd8c0cc952e763246 SHA-1: b65cb5b6efa060a08fe21af449cfa0902c3d8c3b SHA-256: d98424fb7c873a3d157bbc4fbc65eacfb2fb13fc747946392baf8c49082abe90
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam context. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect the user to a malicious site or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • 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://chcial.ru/uplcv?utm_term=zelda+twilight+princess+android PDF link annotation
    • http://paulgraphics.paulsfashion.in/files/xepitor.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/wuzuvijeweporuwawe.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/57078625001.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/javotusike.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/fimowofuwijuvo.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/jaranivav.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/negiwe.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/nulukobakezanugomifi.pdfIn PDF document text
    • https://umutfm.com/resimler/files/88373069797.pdfIn macro / runtime command snippet
    • http://champagne-marc-chauvet.com/images/files/48497386358.pdfIn macro / runtime command snippet
    • https://pinkrali.com/calisma2/files/uploads/lilagujalefog.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/rutavejot.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/85242695622.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/binudokapezisazonugoke.pdfIn PDF document text
    • https://777mto.info/contents/files/97867015902.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kipujutodovemafex.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/71618383708.pdfIn PDF document text
    • http://www.grifin.sk/files/tupetegadapofijogoboj.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/tovogovejikabagumet.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/28264526031.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/90359445772.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f045f2d6a9---84936138324.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/bodenoxoli.pdfIn PDF document text
    • http://gojjang.com/uploads/files/nevepuzidepumir.pdfIn PDF document text
    • https://b2cexpressdemo.com/uIn macro / runtime command snippet
    • 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_off0000bcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BE 17888 bytes
SHA-256: e86a389415602427845bef166918a534446a0fb2c0bc9033b7e90a8a4c50e6fe
font_02_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 10844 bytes
SHA-256: 075796ab4d7f544db312750e702037454a6f995e41c3184d0619ed24ebedd900

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