Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65e35272e91c7a8…

MALICIOUS

PDF

92.6 KB Created: 2021-09-24 06:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 10806e06a6a1ee3ff0a6d7061a944163 SHA-1: 3e8068e2aabfc28defde13e8f38bd314af559989 SHA-256: f65e35272e91c7a83f6eb886b01294032392964e8886d57ab8a4646e9a3f6e8e
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. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=siege+and+storm+free+pdf PDF link annotation
    • http://stromzeleny.cz/file/danijo.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/23668432647.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/46736507943.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/sabaxop.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090804464324.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/wetumovajetivivuleliguk.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8bcaeef6---tatabegemadubovo.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/80851703436.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/88132154731.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/noguladidorazukaxamexo.pdfIn PDF document text
    • http://www.centralperdana.com/file/86992456056.pdfIn PDF document text
    • https://siroyensao.com/upload/files/milukarizo.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/botopugig.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/topukakowufogotewe.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/lixanodaxenos.pdfIn PDF document text
    • http://thaiurethane.com/userfiles/file/diladatasi.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/dupexiwasedelamovafi.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/xubanumo.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-24/20210924055445376920.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/mozizajojimed.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/wugabegatifixevez.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/48242820857.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_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1C 10872 bytes
SHA-256: 0d3c7851495199eb32fde1b069ebc0de72508f48c027c7613102e72c4452d412
font_02_sfnt_off00013500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13500 18280 bytes
SHA-256: 918e41ffc10e6189717edff4575a0e2ba901cc03d34bd91568fb6d5f04c196ea

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