Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80ba0a7ed890c4a…

MALICIOUS

PDF

75.1 KB Created: 2021-09-28 07:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: eb875ccd6ee0c882e7793fb3fed0402b SHA-1: 7cf967db7075931a43aeeff76b45e280cedda948 SHA-256: a80ba0a7ed890c4aa3c297087246a1e07bb1132ca9bb31fb4d5ac8f6756a1675
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern involving directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=iptv+firestick+app PDF link annotation
    • http://lsmtrontractor.com/upfiles/file/20210917105431.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/17226392635.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/96983643112.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/dewibunibenudoxo.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/49644387368.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/venataramozotulir.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/32898499742.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/kiterenane.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/qqskq50nkbpusn7phlsoqbni5o/17831582102.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/55751966117.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/donekovevoremu.pdfIn PDF document text
    • http://fajni3333.fun4two.pl/uploads/assets/file/guzevasekaseri.pdfIn PDF document text
    • http://edmunditemissions.aboutgiving.net/sites/default/files/editor/file/51162866427.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/18582861259.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/35378413146.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613351ff8e073---voxagipetugomot.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/wedivamivopipotulej.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/32598319840.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/kufojaxaz.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/lezuk.pdfIn PDF document text
    • http://megalaserasia.com/upload///rikakom.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/66871397530.pdfIn PDF document text
    • http://njchemland.com/upload/files/17919946648.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/73415368667.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_off0000bbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD405 19708 bytes
SHA-256: 3c004ad3f7b59cae0fb6757534a7b3ba63d2a37e99a20190f1f129fc6ac06f76
font_02_sfnt_off00010803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 10312 bytes
SHA-256: eaf6c9130bab1ce87061506beb4d885da29e65a0a0796e472dd0eadb6cf59428