Malicious PDF — malware analysis report

Static analysis result for SHA-256 9495d4c65045d019…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 21:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e782d34c46ea44d4a247848a9040f502 SHA-1: 3215217b9c09487f613695b8614365d52bda3636 SHA-256: 9495d4c65045d0195afb659b0bb5d40c8678bac729f54f3d9d12c79905833b2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 5

  • 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.
  • 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://szjwwj.com/userfiles/file///surotexoka.pdf In PDF document text
    • https://wheelmartthailand.com/image/upload/File/fexutolovivenidin.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/ditatu.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/22112751554.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/gipuwifagaf.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/24751329863.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/40328220414.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/2437339536.pdfIn PDF document text
    • http://elsped.hu/files/file/dapuritifabitixa.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/60249834985.pdfIn PDF document text
    • http://metroboxservices.com/upload/ckimage/files/xomuxudopiw.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///72108577196.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/93395345704.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/50542245538.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/kuluxozekefasalanexosa.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/kezitemixakubexamewemuk.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/96312557999.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/lobot.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/12652307509.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/xopoxujagezumekiwidexi.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/4915295657.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/39781431683.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/tipifexitowaxonuxux.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/a73de7h9dgr2lo6eh5c932t6d7/rupazetejugav.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/worejunoruwejig.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/dizonu.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/doforagobiwadowifodofitep.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/52758213843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+e+myth+revisited+pdf+free+downloadPDF 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_off0000b5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AF 16420 bytes
SHA-256: bf8b4f549d0e9668476158ffeaa3bd41fa7c0f2df666c3ae8b103a6d13c2f18a
font_01_sfnt_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 10992 bytes
SHA-256: 7884c9c656c45394f18465aa0bd68b88d2ff01eb5a36b02862e8c0c30ed36c3f