Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea2d062994a80815…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 00:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cf58efb4019c4024a79600a96a1791f8 SHA-1: 13f85458731d81939e57621e79f6c9871fc8269a SHA-256: ea2d062994a80815529582287d887573b6daf56f32bf50a74bc3160973131d84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the link farm nature, with many links pointing to disposable hosting and using UTM parameters, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://crewmak.ru/uplcv?utm_term=hdmp4mania+hollywood+movie+download PDF link annotation
    • http://jimsclub.net/new/board/img_tinfo/file/20210924043255.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/rutupojilusupun.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/49757245655.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/89248242971.pdfIn PDF document text
    • http://rayanchem.com/d/files/40051152577.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dce4d0278f---bifilo.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/73100182853.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/1569327001.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/77786365122.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/32173727979.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/53106442417.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/darotis.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/8506623236.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/12701383863.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/72270620023.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/legejijiviromamimativumaj.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/tumotesapekezazaxixozebo.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/tixepabada.pdfIn PDF document text
    • http://drdj.friend-match.com/upload/files/sodavirulabexesiwo.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/vilazopinurigiwoxi.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/vezelevab.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/batupowetejirepo.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_off0000b191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB191 16880 bytes
SHA-256: a2d4da4e0844d8e660fabd1dce768ad27d35d2fea3578bb30b2ae95114b40308
font_01_sfnt_off0000dbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 10624 bytes
SHA-256: 805285dcfbc3083d75ce6f44eafdeca8660354e743a68bc66ae21dd77d7dddb0

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