Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57df7405a00ba68…

MALICIOUS

PDF

88.7 KB Created: 2021-09-18 04:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc7976ea6d3cdba1041a249975d49b5c SHA-1: 3d548d2a8feefcf8fbf0196297fa9d6d61fc97da SHA-256: a57df7405a00ba689b6107ce604f8e74aa005c29cf4ab3c8765a3e59ec66bac8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate the PDF acts as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. This behavior is consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=gas+tank+id+unturned PDF link annotation
    • http://a-xian-coat.com/uploads/files/202109170528372492.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/simaxa.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/23049335641.pdfIn PDF document text
    • http://orthopediedelft.eu/files/24634342574.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/sepijiser.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/lezogorusekatonin.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/90881612470.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae99db06b4---tobudepimenovikej.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/29104153088.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/92349964054.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/jusarolituwadovewedinar.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/1495727735.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/nabosezuluf.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/siwamevuxomole.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/22350023473.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/40256518054.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161443452a3d9a---sogaximuv.pdfIn PDF document text
    • http://video-cycling.de/files/file/pikeponozosesudo.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/62242542759.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/35480644029.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/nidedisa.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/xebudokexavag.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/65373575513.pdfIn PDF document text
    • http://briztravel.com/upload/files/davitabuwerevikefob.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_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 10304 bytes
SHA-256: 91b49412bf97f79fa8702be9f527e64cc6b6dcc1b193b5d6c9a53ca26d7bca10
font_02_sfnt_off00011b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 21640 bytes
SHA-256: d193bae0fc59beb5c01404d5569af000e37f52475169d4fcce1bcbf362fc7955

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