Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc044cdeade5e54b…

MALICIOUS

PDF

76.1 KB Created: 2021-09-17 09:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c1d284894b525b0abf4024609a8fb007 SHA-1: ae46561b510f192329902ef87aadbf407955d62f SHA-256: cc044cdeade5e54b4e9bb4cfc6e83fce2e1d450a25b4d1821a00c17064fa6f91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to disposable hosting and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=remove+password+pdf+android PDF link annotation
    • http://isotope3.pm-ural.com/uploads/files/maraguv.pdfIn PDF document text
    • https://olterus.info/contents/files/45086852509.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/46427255079.pdfIn PDF document text
    • http://glassick.com/userfiles/file/32668121780.pdfIn PDF document text
    • https://latework.cz/soubory/tududosibiziroboveti.pdfIn PDF document text
    • http://maxbrio.kr/files/files/77094211030.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/30539507375.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/13594074375.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/33040824632.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/57225869706.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/14740407701.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/sujojeme.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/2394612141.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c9daa780692776ad5092a926584e34e8/vupodanaxifowijogugitiwe.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/wevidixinamumijerojolo.pdfIn PDF document text
    • https://greenways.at/userfiles/file/78515942503.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/vozenapunuto.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/bubipufivaviwefelawovago.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/lavotaxopoxexodolugo.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/refewimixofamokumu.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4d071d32e7955ac24e60cfc94e696c78/46988763712.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/59384489952.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/fedobozagalari.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/59093129240.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_off0000c510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD22 17320 bytes
SHA-256: 89c8203f25ae63afd009c4381e4e1bde37ff18831f3825077f48312b8f9be37c
font_02_sfnt_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 10712 bytes
SHA-256: 203ad6f6639769bfbcf6fb1cb7488081664e6cd2f62070e2aa04525b4eb6866e

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