Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04bf49453579543…

MALICIOUS

PDF

68.3 KB Created: 2021-09-29 06:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 30ebc336f7b8aa49533d2f07d0926483 SHA-1: f4deb233c1a7fc49c52479faf709c94ce9f0bd79 SHA-256: c04bf49453579543d2ca33b08435226c1778f55073be7eaa7636ca7625778321
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The presence of external URIs and the nature of the heuristics suggest the PDF is intended to redirect users to malicious websites, likely for phishing or to download further payloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rheinmotel.com/userfiles/file/48815845175.pdf In PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c59880e372903fb634aa59698d7b3e73/68299948433.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/51020515826.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/gitolazulibajej.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/pewometudatevusifokuwu.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161413dcce9ca5---95439207243.pdfIn PDF document text
    • http://juha.be/_files/file/12559981888.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/61495455817.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/20151999835.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/xoxesawuseronalunagotavos.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/gukabuvonerozun.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/38064285554.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53122985595.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/tasirirolipepegop.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/luwuwapebelifo.pdfIn PDF document text
    • https://asken.as/bilder/file/8365130209.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/duvemupuwatigonuliwigal.pdfIn PDF document text
    • https://cecprint.com/images/file/folinokizanafanelifivapam.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/8773751830.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/99364644033.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/ritavon.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/kiwibikisaponojekimibo.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/14687494665.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/82932714022.pdfIn PDF document text
    • http://irths.com/upload_files/files/xelokojepukepokiduniv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=oxford+grammar+book+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_off0000b03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03F 14280 bytes
SHA-256: aa4e4efa5140de46d46217f72c71f65033b019b76a89eba0f4911552f5c6f59d
font_01_sfnt_off0000d42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42F 10560 bytes
SHA-256: a68fd271ce0c753ebb75f5ce8f8b8f4103f314fd30efce82677a9ec77e9ac7ea
font_02_sfnt_off0000ebde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1