Malicious PDF — malware analysis report

Static analysis result for SHA-256 194a8f1456d3f93e…

MALICIOUS

PDF

79.6 KB Created: 2021-05-08 00:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49fb85e0e67f392fb33ad8d11478940b SHA-1: 780b1ec34e960e7a3ae6ce2e5c0850a76ecbf923 SHA-256: 194a8f1456d3f93ec77b694de95f69f7f2ca26dbffd143a7f99dd3cdcf21dc87
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly and other hosting services, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, but the presence of external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://nipisod.ru/strik?utm_term=alan+watts+quotes+on+death
    • https://bejelubizibo.weebly.com/uploads/1/3/4/8/134870507/9941325.pdf
    • https://cdn-cms.f-static.net/uploads/4451028/normal_60618021d60eb.pdf
    • https://suxexekara.weebly.com/uploads/1/3/4/6/134635419/vorupaveboxijateba.pdf
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/mefexavedibe-suwodasomewon-xorixepodipatev-nazodiga.pdf
    • https://cdn-cms.f-static.net/uploads/4375522/normal_600ff0b7f0ec4.pdf
    • https://cdn-cms.f-static.net/uploads/4380525/normal_603e620cd9a75.pdf
    • https://viwoxinuzozaxa.weebly.com/uploads/1/3/1/6/131636825/vabavekugo.pdf
    • https://foxesusonixuna.weebly.com/uploads/1/3/5/2/135298742/3058937.pdf
    • https://lifadupelede.weebly.com/uploads/1/3/5/4/135401245/9d41b0.pdf
    • https://peketavapi.weebly.com/uploads/1/3/4/3/134331612/vewejefizapididiwupo.pdf
    • https://bagobizofenagex.weebly.com/uploads/1/3/4/7/134767931/kopagonutew.pdf
    • https://wizenifove.weebly.com/uploads/1/3/4/3/134308138/laxabolugonezisipe.pdf
    • https://nosekixiruwem.weebly.com/uploads/1/3/1/3/131380944/wimiju.pdf
    • https://static.s123-cdn-static.com/uploads/4382781/normal_60025b860be8d.pdf
    • https://cdn-cms.f-static.net/uploads/4426271/normal_606ba763d9396.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b13007e0-0173-450e-8755-18aa33e74470/cuales_son_los_tipos_de_software_que_existen.pdf
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_bb09286d77b94b85bc54f1edbf5ec99d.pdf?index=true
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_312036f9bb704162ab700bad366205ae.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dfe7b281-0402-4b06-8a2e-bd01a81668d4/amplificadores_de_potencia_clase_a_y_b.pdf
    • https://uploads.strikinglycdn.com/files/b6051609-f1ff-4957-a250-6bd621ec4e36/2016_lexus_gx_460_for_sale_in_ma.pdf
    • https://uploads.strikinglycdn.com/files/43708dfd-7ff5-46a9-920a-0d4d87461d7f/john_deere_d140_specs.pdf
    • https://uploads.strikinglycdn.com/files/8cc0b6b3-6c11-46ee-931d-70a191926b59/56909127038.pdf
    • https://uploads.strikinglycdn.com/files/579cd2fb-24f7-48a3-a0c9-6ed48981138d/moral_values_list_for_students.pdf
    • https://uploads.strikinglycdn.com/files/c7ff9ba3-9dec-4722-84fd-ebeda1332492/pelicula_el_mundo_de_sofia_en_espaol_completa.pdf
    • https://uploads.strikinglycdn.com/files/ff28d7c4-e0fd-4dbe-9736-91817dfffe2b/48670442796.pdf
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_c637d5fe3e0947a88e4c17fe6ccf8f09.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_off0000fc5c.bin
43c344c600fb473e3c58b448988db914ed22efd358e53308e05b2950477ef167		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5C 5024 bytes
font_01_sfnt_off00010d7d.bin
d9a8e1b9eef21d38948884a5d9faaefed33c6a9b7264d4cd13c3bbd475133131		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 10336 bytes

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