Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca3d41888cb0056…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 06:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd5311f6101a526830119969fe1351b4 SHA-1: 91c53e54b72fe17634e7e3cfefc406b61422d807 SHA-256: aca3d41888cb0056f182d7db4f71940ffb62db6bca427f32182821ad23ad9590
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are likely disposable hosting for malicious files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of unknown reputation URLs strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://betentour.com/sites/default/files/file/gexiper.pdf In PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/36657729669.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/23725868153.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/goxugiwenemimi.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/93826386974.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/65475090107.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/53715577068.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/midamob.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/dekatisaguf.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/62417231150.pdfIn PDF document text
    • http://wsm.hk/images/files/remukiseravotufosasofix.pdfIn PDF document text
    • http://xsteelstock.com/d/files/wivamese.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4d2d11a09---dujexukubemaxakogok.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/1894735413.pdfIn PDF document text
    • https://wsbtitan.com/images/file/13541183110.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/700f33a000119bdd026a0fd7cbe7d735/45232345656.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/96002233354.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/dejageme.pdfIn PDF document text
    • https://seikai.jp/free_images/files/16573902448.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/tirorade.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/zonulosekixeluxex.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/pupevajobibosiwanunimu.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/rosed.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/kebaluwefivilen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=procreate+android+apk+2021PDF 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_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 10680 bytes
SHA-256: 47990c1900179b357851dec17131eb8d56a7680a858f5fb7312c5681b46eeef1
font_01_sfnt_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 17968 bytes
SHA-256: 8da31ffbba8d191eb9b395d7fe4ad955222d6b79f0167cf6b74a557090f01859
font_02_sfnt_off00012319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1