Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a41de7c0ccd91c…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 02:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 85160bf7828a0ae1807fc58aab2d3d22 SHA-1: 48ff55ce66069eb066ff67d0980ad67d57a2ecc9 SHA-256: 15a41de7c0ccd91ca0153fcefbc335a29202e4d5510adc74f38fd15125b7fbd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://chcial.ru/uplcv?utm_term=european+intellectual+property+law+pdf PDF link annotation
    • http://www.vako.vn/app/webroot/uploads/files/siziragikokuvopebu.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/87691708235.pdfIn PDF document text
    • https://auto826.com/uploads/files/garajotufusemupadodasok.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gasekopatobakigoxorevagen.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/ximopezopegalanarugi.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/52076429133.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/votibiwuvibodigow.pdfIn PDF document text
    • http://attlas.center/userfiles/file/wadosilof.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/pilufofixowisiza.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/mepijewebalumeladoz.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/xomin.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/16427565406.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/kavijewapoxuxiwokixitu.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/536239deac2a8c6841ac1f17c5babfa0/buzosazeni.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/12383518878.pdfIn PDF document text
    • https://eetravel.net/file/15757346812.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/fakofidaxamewotudagi.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/7362495079.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/zotaniseloveziferu.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/69504855562.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6c58e3cb---rofazakomatatoliroboj.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/85043010115.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://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_off0000d75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 16544 bytes
SHA-256: c311224846f358f5b8e53610ffe1edb3e4f8ba5ae10563d5548dd53bae9fde2e
font_01_sfnt_off000101d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EF 10728 bytes
SHA-256: 73fab0e27a47c2bb6213807e8ab2bdd27c734979297d06d1152dd082d071e3f7

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