Malicious PDF — malware analysis report

Static analysis result for SHA-256 3605ed843af44db7…

MALICIOUS

PDF

79.8 KB Created: 2021-10-15 07:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7c0ee987394dc892632ac3d78b7c557f SHA-1: 6c716024894e97b71385b2459fab163881d44097 SHA-256: 3605ed843af44db7e38146ce286d0eb5ff7717b6d3c8e5dc3755c0462aff0b1c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=malformation+type+1 PDF link annotation
    • http://alacarte-design.de/userfiles/file/69467598313.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/legogeso.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/95017267802.pdfIn PDF document text
    • https://securitydm.com/slicice/file/23851523564.pdfIn PDF document text
    • https://0900107678.com/upload/file/kunowigoru.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/nesuwakavop.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/mugiwasipuz.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/79834701196.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/48734286070.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/48654114331.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/renofivisotawitel.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/2225618795.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/wulakekosimadenudev.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/gofekidivijagusunerese.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/61744751390.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc33830b1---35684303749.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/dajulizixevovevej.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/83408349548.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/batijumatobowijamaxotodep.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/xesonenoni.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/30234820916.pdfIn PDF document text
    • http://agmapure.com/upload/files/dupixedizojazixibibuzoji.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/20012848718.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/551087889.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_off0000d548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 17060 bytes
SHA-256: 204fc0cb54549ce0ed5b96f790b1c3c38068c6124e27c926ddafd9c0ba9d0926
font_02_sfnt_off000119a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A1 10512 bytes
SHA-256: a42766b36de166fb3ec468095b44a68900eb06bea4c425c76a365f430c5a81e6