Malicious PDF — malware analysis report

Static analysis result for SHA-256 814512c728df7808…

MALICIOUS

PDF

77.2 KB Created: 2021-04-04 07:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ffa79e347fdc7a185add654adf394f2 SHA-1: 84e33f87cdb2b94c99a313df7458d4ad5225c105 SHA-256: 814512c728df7808e298a4ef733342e21c896c2b8f7b95757d9bc945e723bb27
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://leonvi.ru/wix?keyword=el+cuerpo+humano+word+search+answers', is presented as a search result, likely to deceive users into clicking. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=el+cuerpo+humano+word+search+answers
    • https://masodorenos.weebly.com/uploads/1/3/0/9/130969057/269a7ee0.pdf
    • http://bowuvudofi.scienceontheweb.net/bandura_et_al.pdf
    • http://nelomevasusuf.22web.org/5482765016.pdf
    • https://semowonobepak.weebly.com/uploads/1/3/4/2/134235862/8703461.pdf
    • https://savaxibinis.weebly.com/uploads/1/3/3/9/133997587/lulegakosoleduz-mokejanuleja-rodixurofi.pdf
    • https://xafusotegemuwif.weebly.com/uploads/1/3/5/3/135304795/pujewu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pasawexawinogad/gironaze.pdf
    • https://s3.amazonaws.com/gozilum/nonuruta.pdf
    • https://d7e981a8-8c4a-445e-aef0-60d3d4911bd2.filesusr.com/ugd/65d69c_cc6c216bf4204fc09b91ba02c8c058ff.pdf?index=true
    • https://s3.amazonaws.com/vanatul/2362345834.pdf
    • https://s3.amazonaws.com/tezofuretejom/vufepisimo.pdf
    • http://fukoter.rf.gd/how_to_do_plc_ladder_programming.pdf
    • https://b81f28a7-a6cc-4df9-aebb-a76b708ee4b5.filesusr.com/ugd/df05b2_896afd93b71a47389e5d0db975e23cfb.pdf?index=true
    • http://jokodakive.onlinewebshop.net/3859797534.pdf
    • https://s3.amazonaws.com/gupawupigawono/oak_tree_leaf_guide.pdf
    • http://kulebosux.myartsonline.com/lalejebonadigifikadu.pdf
    • https://s3.amazonaws.com/timituvupame/lujadotunib.pdf
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_65346da61b38410d83cb7a8722f5578f.pdf?index=true
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_53d345d557184659b1e7f6464ec9f996.pdf?index=true
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_b1e6cc7616fc4ca1a97e7593e6be98c9.pdf?index=true
    • 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_off0000edc8.bin
78910aca076538103f8cfc1e05dd3bf073f7ca993b3a60816dd90e7b27162c87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 5364 bytes
font_01_sfnt_off0000ffe8.bin
7e62807d02fb2e5e3c93ecd69b206d1b0b69af5db062f33d121744758a824ffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE8 12244 bytes

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