Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3647310b357570…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 07:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 82558f16f52181febb1dd1e22746a80d SHA-1: a8924222a1b34b69701347346e00e60dfcc6cde4 SHA-256: ea3647310b357570cdb8734b726c575612b63db9430aa694542dc4da58cba540
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan threat. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files hosted on disposable domains. The embedded URLs and the PDF structure suggest an attempt to obfuscate the true malicious intent and distribute further payloads or conduct phishing.

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://marblobaths.ph/app/webroot/img/files/25522299828.pdf In PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b9a22fa8a---80643656330.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/8593647695.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/8995701839.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/67592312886.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/ponizofekugemokagalewa.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210923110313.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/jewevowatudujikedelolebu.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/nimubosomatadad.pdfIn PDF document text
    • http://xsteelstock.com/d/files/pekexulesilujejewexa.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/bofivowopadudemezezekis.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/19613424634.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/sadude.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/vimuvojubopegokimaxa.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/12830628905.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/81139705509.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/rilokogutiwul.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/26279851052.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/rogoxaraxozab.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/kisapiladufetamozepol.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161423b3c8ea18---tonamixivabotolivobax.pdfIn PDF document text
    • http://staropolski.net/Upload/file/pukozasalud.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/82313338193.pdfIn PDF document text
    • https://ismart99.net/upload/files/99555006586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=slideshow+maker+for+android+phonePDF 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_off0000b207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA19 14896 bytes
SHA-256: 8f5ce19a206d9d315f0ad16714d396861d087c244b15b09347f87fdfa45110d8
font_02_sfnt_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 10920 bytes
SHA-256: 543ec00e39be7f16ee6e632e3106c423915514e80dc839eb2c634b48b3b4807d