Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68794398c4a84fb…

MALICIOUS

PDF

43.7 KB Created: 2020-10-24 20:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fc5a5047081b3786f5300ea093bdd27e SHA-1: b8a3e267be46c937ec687cec31b190a078305f1a SHA-256: e68794398c4a84fbfebea97cf0ae6b2278193d9f446fd8d6de4e7cf209090e69
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on Weebly and appear to be part of a link farm designed to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though partially obfuscated, contains text related to 'Oxygen therapy guidelines 2020' and references the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. The presence of embedded URLs and the link farm structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://cctraff.ru/123?keyword=oxygen+therapy+guidelines+2020 In PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/ebb3635b0dac4c3.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/zavegikopereki_buwotu.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/javapopesi.pdfIn PDF document text
    • https://parukiwodisurup.weebly.com/uploads/1/3/4/4/134455528/xolimofof-bojutasodadaja-gupigukob-jezaput.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/de227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f87e51ae120a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_5f8d1b7663051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_5f8766995d457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382772/normal_5f9085a3b9e27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f87dc5f6adde.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/kafeketupojasawufi.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/algorithmic_trading_chan.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/61472424469.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/sickle_cell_disease_pathophysiology.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/51697766994.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/62653973024.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/dirowamipugopugebem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1347/4984/files/516480400.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/atto_digital_voice_recorder_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9132/0214/files/best_hacked_flash_games.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5373/8915/files/12791086577.pdfIn PDF document text
    • https://medlineplus.gov/oxygentherapy.htmlIn 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_off00006a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A8A 5692 bytes
SHA-256: a627fc7dd8e41a2164bfea18618612d0619175a947ab88fc99784b5a44e0192d
font_01_sfnt_off00007dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEE 10720 bytes
SHA-256: 29778670dc08ab3eb1804cbf92c0f6d8ff181983f6100a59bec00d6911822889

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