Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb0cc66a3625638…

MALICIOUS

PDF

79.7 KB Created: 2021-09-12 16:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3938ee3538cfa260cc8cc6fc505a68d SHA-1: 9365a0437de7e2815a4e564bba88fc91f743c876 SHA-256: 1fb0cc66a3625638e116325e7b2d0cec8e426d2a9c1b4dce1cbf3f44ebeb9156
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the use of numerous distinct, low-reputation hosts for redirection, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=yes+god+yes+online+full+movie PDF link annotation
    • http://sakuragiramenandsushi.com/uploads/files/bujugawumijubexasiwozaki.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/36947705988.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/zelibowigexetazawix.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/77674415784.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/5421871205.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/lunada.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/26542283655.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/59265936576.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/daridusizagitib.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/97043862973.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f5237bb5---pitiwowupebubogix.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/61183925870.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/36182402884.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/gasovexosevalonivareno.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/kekarovenamexudaranij.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/pepafukodexugazexe.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/dotubadirasat.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/funowavebojemej.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/44313651329.pdfIn PDF document text
    • http://placc.info/up_image/16475837983.pdfIn PDF document text
    • https://breedlife.com/upload/files/54502090881.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/wiwoxeruzolerusenoguzavu.pdfIn PDF document text
    • http://becucci.it/userfiles/files/54918545905.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/6cfb04b50ef3f124c82310db7d477984/56493164280.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_off0000d50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1C 17344 bytes
SHA-256: c51a713e838a868ea328e46ce23073f41cb305fd53cacdf3bec64c5faf0e7f76
font_02_sfnt_off0001199d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199D 10600 bytes
SHA-256: 9303b80c9112db45124717ff5d1cdc5f85fbea344334b0e28ff6bd1aeb065bbc