Malicious PDF — malware analysis report

Static analysis result for SHA-256 77471c0847b526cb…

MALICIOUS

PDF

82.1 KB Created: 2021-02-16 07:12:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 89ae95b5c65e13f210ea2bee717241f1 SHA-1: 4d5214ced92f2f267d6fe3da131d94372d929a6c SHA-256: 77471c0847b526cbb8ff791b973e3bfb23ff9a8f19c126f4981b139850aa1c7f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable hosting and acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=ancient+hebrew+lexicon+of+the+bible+pdf PDF link annotation
    • https://xelixaxoso.weebly.com/uploads/1/3/1/4/131407481/4750802.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459328/normal_5ff7cdd303a01.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/Yjbgthi/68203452582.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/Gjjnl0X/samsung_curved_tv_split_screen.pdfIn PDF document text
    • https://guvixiwek.weebly.com/uploads/1/3/5/9/135976323/58d588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471512/normal_601d6bf2b2b64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471455/normal_60050f99b978c.pdfIn PDF document text
    • https://sezavifibeka.weebly.com/uploads/1/3/4/4/134463458/e9cfac4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382420/normal_5fcf2e886e44d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dibiremiva.rf.gd/85482370974.pdfIn PDF document text
    • http://moliwofasekimu.epizy.com/sezotozojojasudedi.pdfIn PDF document text
    • http://kuxoxulid.epizy.com/baumatic_double_oven_user_manual.pdfIn PDF document text
    • http://pajamubo.rf.gd/soccer_ball_template_to_print.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000115be.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x115BE 16612 bytes
SHA-256: bfe4a72a6ae5b51d27e91ea7d85c1f3fc6d91cbb7ccec70be731963dda5fcedd
font_00_sfnt_off0000de19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 4932 bytes
SHA-256: 00fdd69556588d04d61097ddaa1a8eab2902c5a8822832bbc73ea5b40d24e88c
font_01_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 11472 bytes
SHA-256: 20797f6d66154b168aee4beda09a2516fbca06f48889c4828602fe77a613c90f
font_03_sfnt_off00012ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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