Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae37fc9f3b87f9a…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 13:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 91a2f8822a46da10dfd2c5e714a1b8f1 SHA-1: 886d03b0c088349fe4295c16132d5b5dcc4df084 SHA-256: 7ae37fc9f3b87f9af7f355d49df77f704f9547b3a0b70292891371c5c67302f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to form a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=aplicacion+para+grabar+en+camara+lenta+android PDF link annotation
    • http://chandravanshi.com/userfiles/file/84314322219.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/97672265093.pdfIn PDF document text
    • http://princeverma.in/uploads/files/sizifipapitusagu.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/60933675888.pdfIn PDF document text
    • http://dgjst.com/upfile/file/milaniraweje.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bad6196937---figuvalixipiwabuke.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/68941195530.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/2706526418.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/79183445007.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/gusisudevodulajolejax.pdfIn PDF document text
    • https://olterus.org/contents/files/95439732801.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/4es69nf93eao7do2ghhdk8ji7l/gagidubepevavopadik.pdfIn PDF document text
    • http://parfumland.sk/upl/kokulafipujonolesox.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/gifobonab.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/28025566649.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/50847976931.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/72741987165.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/88919611056.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/25943973779.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/3118912380.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/84877845380.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/duzijozekeneroro.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_off0000b3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D4 17732 bytes
SHA-256: 5baa0da813aaf14a582ceac148dffac36be45086c4f3acd35f34bd1110b1b211
font_01_sfnt_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 10808 bytes
SHA-256: 7a58c9e17c016065065e17b9f418d8d84bfb022c62c11b820f90aebe950d7e48
font_02_sfnt_off0000f970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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