Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea24deb782b8cbc3…

MALICIOUS

PDF

68.5 KB Created: 2020-12-17 08:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edb1bc1638f96dc3d99e09b07cd89e7e SHA-1: 18f12ab97fa1792f9f32d7bdceb7b29579356081 SHA-256: ea24deb782b8cbc3947ec5170be37e10c812218ab31d2f4788ba4de4d70e3c6b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link and a link farm on disposable hosting. The document body, though heavily obfuscated, contains text related to a 'Rinnai tankless water heater manual', suggesting a lure to disguise the malicious intent. The numerous embedded URLs, many pointing to Weebly-hosted PDFs, indicate a likely phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://gettraff.ru/strik?utm_term=rinnai+tankless+water+heater+manual
    • https://sewuvemap.weebly.com/uploads/1/3/4/3/134377394/7179543.pdf
    • https://gepagalegizexu.weebly.com/uploads/1/3/4/4/134478943/wukizop.pdf
    • https://vivorewipaxuje.weebly.com/uploads/1/3/4/3/134365477/rabob_ronag_kububupixibubur.pdf
    • https://valogasode.weebly.com/uploads/1/3/4/3/134320371/zibademefo.pdf
    • https://xulavuxedipi.weebly.com/uploads/1/3/4/0/134017657/rilasi.pdf
    • https://pixasarajesuwov.weebly.com/uploads/1/3/4/6/134688766/7061014.pdf
    • https://cdn-cms.f-static.net/uploads/4461202/normal_5fd26141d74b9.pdf
    • https://litolojinoforiw.weebly.com/uploads/1/3/4/7/134721995/legifisu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc326f27848ba205d273b7f/t/5fca54ffce99df42d39a1717/1607095551458/extended_weather_forecast_los_angeles_california.pdf
    • https://s3.amazonaws.com/sefiwegegagu/detect_thoughts_3.5.pdf
    • https://s3.amazonaws.com/pajukovuxetu/vovatamugugidarufesozoted.pdf
    • https://uploads.strikinglycdn.com/files/5200a34c-2108-406c-8a47-dc117b7f3bd6/avocado_mattress_black_friday_sale.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ac.bin
5a6e33f3f0a9d37a59d042a1457cf7e579d81f2de63e6056b6733ba9027fee6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AC 5088 bytes
font_01_sfnt_off0000e1e6.bin
cb62355accbe067b9b0d0a2966607e167f0e461df971d320cd348376d0a7866f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E6 10432 bytes

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