Malicious PDF — malware analysis report

Static analysis result for SHA-256 f46f4f7f47853940…

MALICIOUS

PDF

85.8 KB Created: 2021-09-20 11:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10ff8f08bab68e5eec0e8f86a7705b64 SHA-1: a200a23efb2cdcabe41c9d6e47d4fa8cdde95bbe SHA-256: f46f4f7f47853940d77cda7bfecd9dc0a348a5c7b0aaf8e2dc2b12a49ecc6f13
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a heuristic firing for a link farm, suggesting an attempt to redirect the user to malicious content. The presence of a 'download button' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or trojan delivery attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious workflow, likely involving the exploitation of PDF vulnerabilities or social engineering to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/79c23e3776ba2972d83778814c0fed96/xavonasosonowu.pdf In PDF document text
    • https://soudurelauziere.ca/upload/editor/file/wabululesadofidotit.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/97846154697.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/16324905673.pdfIn PDF document text
    • http://yuli-china.ru/d/files/guwafotapozusojibi.pdfIn PDF document text
    • https://lordoptika.hu/files/files/93861500445.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/1d314f6a4e6d096abe9042b9625111de.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/xoxuxomipikirupukeg.pdfIn PDF document text
    • http://master-vin.ru/files/file/petoku.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/rikovulelonajakobovesor.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/75063649462.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210905095924.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/kunumivakojudisejox.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16148341a86ad8---23223847299.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/38586315686.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/17944461838.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/jojatepebavuwevosa.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/22572848595.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/14636815594.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/gatotowivobo.pdfIn PDF document text
    • http://qdcmd.com/data/files/zawefenipidegufimotuwur.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/bitewodiguwewelisu.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/12539428208.pdfIn macro / runtime command snippet
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210913_C633CCAAA33FED3C.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/waredimutefolulef.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/sosuvuguv.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/40940051026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=emulator+portable+untuk+pcPDF 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_off0000ea00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 18468 bytes
SHA-256: 707c3a74d91828005f62530c562d2d96502607d1e162853d14815e42b161a99c
font_02_sfnt_off000131f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F0 10592 bytes
SHA-256: 7a86fb08050540eab7224a5453e12437fef16c4c6afdcebd2f6d7fb61636ca17

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