Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59e6f18ee8a8535…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 23:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36c9dbdc2c47984a91776fcdf47f8368 SHA-1: e9c9ea0fceb4e94c0d714eea713f22974c977da7 SHA-256: e59e6f18ee8a853523e72950ed3efddf3e06cb07bb16c325faa6bd5ecdc896bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports that the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=usb+tethering+is+disabled+in+my+android+phone PDF link annotation
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/17958433867.pdfIn PDF document text
    • https://senegal4d.com/contents/files/95530640541.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/wojagalowowevajew.pdfIn PDF document text
    • http://rld-carbon.com/file/vefetizujirased.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/sofajaledaranudagum.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/gobavalotukimelujolisi.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/rabikojufizawubowa.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/41528104063.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219800128946.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142ef8c41cce---87300795524.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/sesuxavonuwinarik.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/91427851297.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/zepurekuxawe.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-6/20210906182842842975.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/74743581022.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/84433189384.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/pupewobofexe.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/wenirolegokatetewirajefa.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/bologimikezu.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210912_BDE1D2F536924CCC.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/46769794217.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/nesug.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/bufetovojilefune.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/vujoroxu.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_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 11100 bytes
SHA-256: 66e46c48beea14963c8723c07df3cd07550d2d69570d79db19e13def437c6a27
font_01_sfnt_off0001021c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021C 17656 bytes
SHA-256: e7af2fd10ed393c473c1183cc3df0081dbcd6fa4aeb9c27e0baa0eac84e001a6
font_02_sfnt_off0001305b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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