Malicious PDF — malware analysis report

Static analysis result for SHA-256 e641b2aa2ce1db6d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 18:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a61b019dfa2f7f0365b1f6414bc5c50b SHA-1: b0ef67dc71d00f0eed57ae4339b5fa82a06ac011 SHA-256: e641b2aa2ce1db6dc8254f63296ce5f9a49f4a056d05525f87dfc5314ee34fd9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. The PDF structure and embedded content indicate it's designed to redirect users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://taksis.lv/taksis/userfiles/file/59398309920.pdf In PDF document text
    • https://marblobathware.ph/app/webroot/img/files/zimiwuged.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/65618252108.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/92136614580.pdfIn PDF document text
    • http://stylekd.ru/files/67892488702.pdfIn PDF document text
    • http://irollee.com/userfiles/file/powewapuvanaxizakumoto.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/86848382220.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210905_3783C625797A316B.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/kafezaz.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135dca0e3a27---puxezifoforix.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/40101212156.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16136ce82c5b87---bidilazo.pdfIn PDF document text
    • https://noventa.cz/media/files/file/wimegalasikuzamo.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210902111953.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/34328020487.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/poxidujakefaxuwe.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///80452665625.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/8854924798.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/raropitusi.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/2689053322.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/4689090029.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/kuwufitilefoboravobidob.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/sefarimimaxaxuteb.pdfIn PDF document text
    • https://trieurodata.ro/images/file/belevovaz.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/vutimebazezudavexanobozij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+turn+talkback+off+androidPDF 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_off0000d4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F3 18820 bytes
SHA-256: 9791561fb847c9f86effb72e442c0de26f659466c80bec3df046b37d25cb65e9
font_01_sfnt_off000105c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C4 10576 bytes
SHA-256: 11eb42b3a8a39c2e4f8847d74cc015f4888df46f2e1be9b629af98d14c8f323a
font_02_sfnt_off00011dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1