Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f574831cc64a09…

MALICIOUS

PDF

68.8 KB Created: 2021-05-01 07:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 78da05a982ef6560ba231b87ad730043 SHA-1: 2f58dd8adb4d2417b5fd0de4c8507fe64f632455 SHA-256: 21f574831cc64a0985ca38c97272aba1fb5fb14155c42ca8faa8efc808ab6b0b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=interactive+fraction+bars+online PDF link annotation
    • http://lighttravel-ng.com/38552557910goryi.pdfIn PDF document text
    • http://mozovurezet.iblogger.org/4987460956.pdfIn PDF document text
    • http://xefijemav.iblogger.org/bow_tie_medical_ohio_llc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410414/normal_6059b63c09fa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_602e37aea7763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486220/normal_60223d730b5f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387417/normal_60025f41a6d92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_60132c6330838.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456398/normal_5ff955e6b45e1.pdfIn PDF document text
    • http://jazesenebadajak.iblogger.org/kenmore_70_series_dryer_belt_replacement.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475197/normal_603634b9b08d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408704/normal_600e5e06961b3.pdfIn PDF document text
    • http://uorott.com/culvert_installation_guidekcsyi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kotalozobazad.rf.gd/pathophysiology_of_anemia.pdfIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_7967dedfd15b4440baf899c693714ac1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b071038-b758-404b-9ca5-ea3d432da58a/43852734505.pdfIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_b31fa9b4de7244409031d8ff20406a06.pdf?index=trueIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_7a96cfceaa78476bab5ba991f321bc6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/823cc97d-660e-4a70-bf32-dd031d1a1914/narimesugo.pdfIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_13a086b807c047a386f68ee8cc4860d4.pdf?index=trueIn PDF document text
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_cc8983353ddf45c08f762e2d192c4e88.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d05edb22-3ab6-4f2d-ad09-ebb1f6ba61ca/arduino_starter_kit_example_project_3_-_love-o-meter.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_off0000cee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE8 5012 bytes
SHA-256: 604bbe0befb2bf4df93777b92e04cce26cdb7fa4225f03474a2bf6532c22d352
font_01_sfnt_off0000e00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00B 10596 bytes
SHA-256: 29951078f4c33ff3559a2e50d455766f5db9eb89002ab97d677d2dece3e3261c

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