Malicious PDF — malware analysis report

Static analysis result for SHA-256 0972ae124902bdaf…

MALICIOUS

PDF

71.1 KB Created: 2021-10-05 02:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e54f44d273c6ec9b1a74726694cb98b SHA-1: aca0cb7ef79a2b2432c8beca74a60392812e67fe SHA-256: 0972ae124902bdaf2c14293f79b2a90281243fd552ea58127156c0d5914241cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=north+meck+high PDF link annotation
    • https://pisangmanis.com/contents/files/sededawizudijejuga.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/woxadebekoperinerosari.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/65501008486.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614282891acde---55832251961.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/saguxuvesobonetunagip.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458149369a9---zisafodamafi.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/32765941335.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/92251739549.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021100185232_745722755.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/14978239811.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/gofezufoduretanisotokupe.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/xikugesak.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/35905951169.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/bepafaxovirixazez.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/polavinosuborujanuz.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/15907959067.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/42374039982.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/zenif.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/31250304274.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/16846093014.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/guvajal.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/gusibepuwulidoxuzizag.pdfIn PDF document text
    • http://tulga.ru/editor/files/29621344198.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_off0000b3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE0 10264 bytes
SHA-256: 7d072bf3b4ad54cc87185ea3bc6a6f3007101485492f257b23506d1831225330
font_02_sfnt_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 17052 bytes
SHA-256: 246a2ee8d789e158f8c77404e5e5d1560794a52694d87b297de362d86f28964d

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