Malicious PDF — malware analysis report

Static analysis result for SHA-256 c749a1bb81f02202…

MALICIOUS

PDF

81.9 KB Created: 2021-09-10 23:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4ff3f487abfaefc44fe499bac9fb0ac SHA-1: 6dbf64bd9a7f3676ad6749996ddc4fe55a03fefc SHA-256: c749a1bb81f02202bb1b3e7624cb541628dee699d6b207a82c232cef42fe3c23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous embedded URLs pointing to other PDFs hosted on disposable domains. The primary purpose appears to be directing users to a collection of malicious documents, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381bfed82c9---18566989548.pdf In PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ce98bd2b7863ca373d42a582e7809b0e/vedigomewukiwofez.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/46334909237.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/zutanonerozo.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/dijufidejixexijafetowijaj.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/lubitom.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/wudiwogoli.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/24774816240.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/dexoliboka.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/84673817131.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/tefomusorijixeg.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/pilerikupuvofekajat.pdfIn PDF document text
    • http://quinta.cl/upload/files/lujadanel.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/87061115016.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/rujajadole.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/63445991794.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/430069531.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/58483742454.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/99836244150.pdfIn PDF document text
    • http://precisao.org/files/files/miriwep.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/sibula.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/84629011300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=genki+2+pdf+free+downloadPDF 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_off0000d735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD735 10564 bytes
SHA-256: 0ae794ef9c720010398ea9337034539092e24b17f7ac82fc72d50f34ea678022
font_01_sfnt_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 19256 bytes
SHA-256: 0c270b2aec38553fe12ea8ba861f3e441d0ade546981f08af564831b3b96f718
font_02_sfnt_off00012238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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