Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75df7ea3580adf4…

MALICIOUS

PDF

71.5 KB Created: 2021-09-09 01:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8e15486291191afe4b9cec1463a9c4bc SHA-1: 2299ced6a131db58a6d9b14f0c76256fcd267709 SHA-256: e75df7ea3580adf40fe82ec728c7b7bc6db912f11b1f5d7f701ee677e5b8bf1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://rivieresoceanie.com/userfiles/file/magexo.pdf In PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/4550956436.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/fuzizozujo.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/fawulikunexe.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/zajimumejesosabavarope.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/ravoz.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/saruzepokepo.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5a9f1be7---zelutuforava.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/penofunizibizigakoxid.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/f823b36cc90ac11edf5a83fd9bc6944b/venujalovafejonizolaxe.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/47675971939.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/60472491639.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/39215351902.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/42746566950.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/jorerevafomutibuxokezonu.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/68742085392.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/67058191008.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/linijazok.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/5064662381.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/81938937367.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/xadiwatumivatofitiwumufa.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/limodilajirav.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/85154349740.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/tunemuziduwubapes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=davidson+23rd+edition+pdfPDF 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_off0000b9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DC 14828 bytes
SHA-256: a9cebf1f7e079047d485fdccdc89694e25253dcfb11bda19692978a63996386a
font_02_sfnt_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 10804 bytes
SHA-256: 61755365dc5618dc21dbcbfdd668fa9bc27d4db0794a8033345a3e3d334f1834

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