Malicious PDF — malware analysis report

Static analysis result for SHA-256 5999d0641e457d5a…

MALICIOUS

PDF

76.0 KB Created: 2021-03-21 01:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 51bcf1d6e363ba6b9439bfb815044552 SHA-1: 140cd9d5b0c4dc5484f66dcbbedb8d91164c6b45 SHA-256: 5999d0641e457d5a69e728fc2132b6c335a49bf3ce9ed18a28688665e3b479c0
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text suggesting a lure related to 'ham radio general license manual pdf', directing users to external sites. The presence of numerous distinct hosts and disposable domains in the PDF's link farm heuristic further supports a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=ham+radio+general+license+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445128/normal_603e6e9dc749f.pdfIn PDF document text
    • https://rapofureduf.weebly.com/uploads/1/3/1/1/131164295/46687612c91b0.pdfIn PDF document text
    • http://muparizuxufuxud.22web.org/1680777956.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/jHphbmg/notulozejazep.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/ihx7jgh/old_games_for_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454545/normal_6017309fe0b03.pdfIn PDF document text
    • https://lugexobamav.weebly.com/uploads/1/3/5/9/135965248/5150540.pdfIn PDF document text
    • https://taxezuwijukiwum.weebly.com/uploads/1/3/1/6/131606901/kakizekakuru-nadenubitetuk-wafagopulumimu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385620/normal_6047ab82e0589.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420431/normal_5fce62841badf.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/b28601.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://novisagaxorom.epizy.com/95290970590.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/vebiri.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/trasformare_da_kg_a_grammi.pdfIn PDF document text
    • http://wiwugaku.epizy.com/27999401292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f21e05d-e13f-40c4-bee5-0c5a241c30ac/tokujejuxinij.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/guyana_passport_application_form_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51acc7dd-ea54-43ea-873d-b098c5e50603/rizibesivexikemipuwen.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_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 5436 bytes
SHA-256: 9c4da835317423c89fef7ca519321421ae187137d5cdb7bbee18109d0b549249
font_01_sfnt_off0000fe3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3D 10924 bytes
SHA-256: 1d3cbe33a4fd1cfa4bf8b4011f45a52690ff34de074d0956199d204b661283b6

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