Malicious PDF — malware analysis report

Static analysis result for SHA-256 b715169ac3dc02cf…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 11:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec548eda1ec6f865ae0a6d50cb0c65e4 SHA-1: 8d4114f8b0b04695e5422fc2e24dc736e0f76bf7 SHA-256: b715169ac3dc02cffc44e695f66707f4284bce7dfe2ca3753f267d7ab3c67392
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable or suspicious domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is used to distribute links. While no scripts were explicitly extracted, the PDF structure itself likely facilitates the redirection to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff7d3e5a6b---ridusopo.pdf In PDF document text
    • http://maymaygiaydachidang.com/upload/files/14136387375.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/85102332661.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/35197719514.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/69415783954.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/13457370210.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109221650514089.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/74440316238.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/fosemenanunokeku.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/miroxewadu.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/bemulexajumofo.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/rukesuladuwuturijodoge.pdfIn PDF document text
    • https://mkontakt.com/dat/file/29565921519.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/9230833332.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/gedubom.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/dalunalojeg.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/luroge.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/rafotisawitipinibija.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/zijagekazijufisajidizo.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/87376953148.pdfIn PDF document text
    • http://askort.pl/Upload/file/gokiluxalan.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145221f0c83d---nikodag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=among+us+windows+7+freePDF link annotation
    • 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_off0000ad0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD0E 10608 bytes
SHA-256: fe516eb6ccf0205bda781fd30a887402d4a5cf5a75f463025a006ab9b99b5a98
font_01_sfnt_off0000c533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC533 16208 bytes
SHA-256: 597859cf3e1a8159ab14528a872d98f5389aba47bdca451f9220dbacefaed077
font_02_sfnt_off0000ee49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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