Malicious PDF — malware analysis report

Static analysis result for SHA-256 be51418fbe8f175b…

MALICIOUS

PDF

72.9 KB Created: 2021-09-14 07:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02eaaea7fd832a9e60dc41f715451370 SHA-1: 78e72b008c46b48ec6efd77b6bdb669dd6d555f9 SHA-256: be51418fbe8f175b9651474a9c6ae0596136eb712100af76ace0d59690033285
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF viewers or redirecting users. The presence of numerous external URIs, many pointing to potentially disposable domains, strongly suggests a phishing or link-farming operation. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://inprovitcentroamerica.com/ckfinder/userfiles/files/61094153851.pdf In PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/70284632057.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d3560b8c1---64663551167.pdfIn PDF document text
    • http://freeorden.com/media/file/xaxuwiwogotaxiroxobadi.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/83260806658.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/10871691178.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/gumikodutebud.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/54442461308.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/10517094991.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/7139292509.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/4744866471.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161327bad8ee44---nufomexekirelazivasuwada.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/10708677040.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/54745448992.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/43489886857.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/78667158477.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/15283341442.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/58290882438.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/33681411803.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/gawuxesure.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/10745266839.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/88281738014.pdfIn PDF document text
    • http://klemanpince.hu/files/file/40677727741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=read+the+passage+and+answer+the+questions+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/biludu.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_off0000ba26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA26 11108 bytes
SHA-256: 020ae86eb9d720ee56dd6849c6a07bac0d3691cb2f074f772a54dcc0c78c0eb9
font_01_sfnt_off0000d385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 16924 bytes
SHA-256: 395073f1420243450164f15d7e0454c195f365872cf0c4eb15b2cce13fefadab
font_02_sfnt_off0000fe00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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