Malicious PDF — malware analysis report

Static analysis result for SHA-256 befc8eaba3ae22bd…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 13:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 21eb60e37cf43b66576bf455a2905529 SHA-1: 73a8fd6facd4b1cc948196e91e92a3f4ef2476cf SHA-256: befc8eaba3ae22bdcb3ad1c995e8eefe2128c42ccfb2c954a46f87922800a194
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including brand impersonation (Amazon) and a link farm. The embedded URLs and the ClamAV detection strongly suggest a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious workflow designed to trick the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pixel+gun+3d+mod+apk+unlimited+coins+and+gems+2020+ios.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://usa-ex.com/images/blog/file/vukerarasunitogikas.pdf In PDF document text
    • https://cplastik.cz/data/cms/file/pojumosuruno.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f50e182d2830c47aaf8f6d9f29b9a34c/jefavigaju.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/31126631760.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/33213570436.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/bafiwenazelolinuk.pdfIn PDF document text
    • http://jar-ted.pl/file/vuwatosaporewugomivida.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/tegopasod.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/84281828594.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/tutas.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/74875163902.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/soniwaniko.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210905230937.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/25270828473.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/43167918059.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/1328181836.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357a8f773bd---nadubovilolipuxopelufe.pdfIn PDF document text
    • https://adikkedua.com/contents/files/2283098042.pdfIn PDF document text
    • https://htchninc.com/d/files/76001822161.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/bufawijotasu.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/fonovezesunamoxigef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pixel+gun+3d+mod+apk+unlimited+coins+and+gems+2020+iosPDF 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_off0000d486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 20256 bytes
SHA-256: fb469464366caf4163c267b20b2eaa104ad6d7933a4846e40df022731e5fff48
font_02_sfnt_off000121a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A6 11468 bytes
SHA-256: 4d92128f6fc438491de4e90be3f2baf3a4398ddb5e0a1070a159eec03d59453c

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