Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5558f47f6fe53c0…

MALICIOUS

PDF

89.9 KB Created: 2021-06-07 01:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2b316a7f8bca9838ed7470d6b97659bb SHA-1: e9e7b913f5a5419ac9079652411bf498d5d29196 SHA-256: a5558f47f6fe53c0a226fe0b2d334338916ed17e97ca2e0fa2d23cb1c8b49146
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm PDF. It contains numerous embedded URLs, with one pointing to 'infrive.ru' and another to a Weebly-hosted PDF, suggesting a redirection or download chain. The PDF structure and heuristic firings indicate it's designed to lead users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://infrive.ru/pbw?utm_term=yog+lore+era+of+chaos PDF link annotation
    • https://vumevomuw.weebly.com/uploads/1/3/4/3/134335884/3712305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485800/normal_605f5aab534ac.pdfIn PDF document text
    • https://nuvitawejizi.weebly.com/uploads/1/3/4/7/134767919/b57c66e2b1a.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/899d7827e08cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_60627c0c6d672.pdfIn PDF document text
    • https://jaxedafotonomut.weebly.com/uploads/1/3/4/8/134885779/9756982.pdfIn PDF document text
    • https://bikirufiw.weebly.com/uploads/1/3/1/4/131452989/binikojan-zemonufuvuxeme-lajopa-bovegivadimogo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401985/normal_5fc87cb47b124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501364/normal_600abe2f2ff65.pdfIn PDF document text
    • https://xoxebugifujame.weebly.com/uploads/1/3/4/4/134478015/fesixatovezuxafeza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446286/normal_5fe656239a867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453909/normal_605b6f3da6fc4.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4479433/normal_60b558ba53ae1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifilipisi.pbworks.com/w/file/fetch/144574992/beziminalitefarapev.pdfIn PDF document text
    • http://febokipup.pbworks.com/w/file/fetch/144578607/how_old_is_pilar_pascual.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144419772/les_alphas_livre_du_maitre.pdfIn PDF document text
    • http://fixunomavow.pbworks.com/f/69975602497.pdfIn PDF document text
    • http://kepigiwup.pbworks.com/f/dinunugubeja.pdfIn PDF document text
    • http://bojirakaj.pbworks.com/w/file/fetch/144751236/63001821427.pdfIn PDF document text
    • http://fokurid.pbworks.com/w/file/fetch/144684972/mastering_apache_cassandra_3.x_-_third_edition.pdfIn PDF document text
    • http://didaneguk.pbworks.com/w/file/fetch/144427350/kusajujar.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/w/file/fetch/144419196/modern_spanish_grammar_download.pdfIn PDF document text
    • http://pebegijopolo.pbworks.com/w/file/fetch/144587679/algebra_and_trigonometry_structure_and_method_book_2.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 5104 bytes
SHA-256: a4b1232d07962d7ee4396edd257528038ad911dce3a3eaeb6c1ce5c4c60254c2
font_01_sfnt_off00013553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13553 10964 bytes
SHA-256: 5682f50a45135b64a20090a936ea703efe0285444fb54bd4bfa95d23aa19419e