Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab125a2c84b5665…

MALICIOUS

PDF

76.6 KB Created: 2021-09-19 00:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf98734c5d70c52ed2c9e6053688c52f SHA-1: ead70c6d915d6ab11fa31949c4d458e26ff2ef82 SHA-256: aab125a2c84b5665e823aa763318694122213455edcc3bfb36ccae832741c1d5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links, many of which point to suspicious domains or IP addresses, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of exploitation techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=android+connected+to+wifi+no+internet PDF link annotation
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613618dd61d09---ledidupekirivujo.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/binisumojafujebi.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/6477605026.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/90877370630.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/50461518304.pdfIn PDF document text
    • http://kbchina.de/upload/pomoba.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/safajutoxiwunedimodasin.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/28882927359.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/denemisefilazonunizinati.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/33642792263.pdfPDF link annotation
    • http://nwatchonline.info/userfiles/file/81191409654.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e5a75c593---17076086843.pdfIn PDF document text
    • http://analhospital.net/file/files/79824242424.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/meramoresafofonobewa.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/lomodisugibibewadaju.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/37047029469.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/89967361334.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/mevexumer.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021091112114994.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/63153179987.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/guwifutewosev.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/pepumoniwowotefanosuwode.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/49731030911.pdfIn PDF document text
    • 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_off0000c7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EB 17696 bytes
SHA-256: 4368c807ebd25805f7525a8643f52c149cfcf1f659259b7abd932cec71122d53
font_01_sfnt_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 10160 bytes
SHA-256: ecaa86b92679b558040060d805c8c5118e107e8cb2d17f1f5c2e9f6d3b928c2f

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