Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3b54b6d799224e…

MALICIOUS

PDF

81.9 KB Created: 2021-02-27 12:53:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6f3cfef8438d1b9b397e672880561d5c SHA-1: 8693beb2b2a14a94d85d130a4f8572f6fe0e3492 SHA-256: fe3b54b6d799224e2c694f3c3f690f257f4593ca99fabe5c38bc1e753354eba3
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The primary lure appears to be search engine optimization content, as indicated by the URL containing 'how to pair a bell remote to a samsung tv'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://resalured.ru/123?utm_term=how+to+pair+a+bell+remote+to+a+samsung+tv PDF link annotation
    • http://tulakijumipad.22web.org/certainteed_warranty_information.pdfIn PDF document text
    • http://datidino.iblogger.org/4560484608.pdfIn PDF document text
    • https://ribigitapupag.weebly.com/uploads/1/3/4/8/134887221/d9e47f85460.pdfIn PDF document text
    • https://bapumora.weebly.com/uploads/1/3/2/7/132740837/e7803.pdfIn PDF document text
    • https://segamivudafipem.weebly.com/uploads/1/3/2/7/132740242/0e35ed2d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374196/normal_600c0078d4cd8.pdfIn PDF document text
    • https://wemivera.weebly.com/uploads/1/3/4/3/134311686/51986cb90bc1.pdfIn PDF document text
    • https://webopetul.weebly.com/uploads/1/3/5/3/135308940/9221716.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/nawavo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381788/normal_5feb593e6ea48.pdfIn PDF document text
    • https://xoluvaxabezil.weebly.com/uploads/1/3/4/3/134338990/d2595db0.pdfIn PDF document text
    • https://josodurug.weebly.com/uploads/1/3/5/3/135394296/taziz-dukunota.pdfIn PDF document text
    • https://wufodiwefoveve.weebly.com/uploads/1/3/4/8/134891768/36e2f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://posojorodinu.epizy.com/43942806349.pdfIn PDF document text
    • http://gizejofak.epizy.com/chhello_divas_movie_video_song_free.pdfIn PDF document text
    • http://wedutatitupaze.epizy.com/presto_06857_electric_skillet_16_reviews.pdfIn PDF document text
    • http://zatopava.epizy.com/how_to_start_a_formal_response_letter.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_off00010372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 5392 bytes
SHA-256: 5e4f0a09742c9eb0b14b64e9859ed27ec588b9f0c7779c29eadf0fc614ef9ac8
font_01_sfnt_off000115c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C7 10824 bytes
SHA-256: 1ae91d267425dacd806422149e0f2d4c46db63c6835a2db06f65001cdc727153

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