Malicious PDF — malware analysis report

Static analysis result for SHA-256 23086b233bb9fc2e…

MALICIOUS

PDF

75.5 KB Created: 2021-09-12 23:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84420985549d4df0c09b2e267aa64d0a SHA-1: 9bce399d6f2eb06e9f7893b9ecc6af4cd1ab70b9 SHA-256: 23086b233bb9fc2ef412facf64eb665215cc9d75d9cc1b686f6bf56d010f5311
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the execution of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=lightroom+ios+free PDF link annotation
    • http://zgic.ru/!upload/files/lagisonafuziwupotog.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/91676553419.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/92450804760.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f18fed7710---vefozumejud.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/78912991537.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/4302804113.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/92565486039.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/85023504570.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109031301058753.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/8163132998.pdfIn PDF document text
    • https://ysh.my/userfiles/file/50339018915.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/gubijizugigitixa.pdfIn PDF document text
    • http://iphysiology.ru/upload/gisetodumidumajerebuwu.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///mokozodek.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/53032661003.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/55806069651.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/35713369294.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/72206767935.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/52535358337.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/kojurimopujudomusixebu.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/1464981266.pdfIn PDF document text
    • http://deforma.it/userfiles/files/45324358823.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/majulivojopazeji.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/wobig.pdfPDF link annotation
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613b779ae43a9---pawumevuwumuredif.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/65661807976.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_off0000c5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EA 16836 bytes
SHA-256: 78240b11ad0cfa6334c41b94c8eefbdde3d38bafdb90097e588523dd2c524898
font_01_sfnt_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 10304 bytes
SHA-256: 527386410825e358753362e9b9669681474faf33c0e90385ae001517bea22a8d
font_02_sfnt_off0001082c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1