Malicious PDF — malware analysis report

Static analysis result for SHA-256 74914c8aa44fd1a0…

MALICIOUS

PDF

75.5 KB Created: 2021-03-22 04:22:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9e48e779591da6c30c81024a275108e SHA-1: 19b658e15de9134017919ceeb1ea4fb944cb0103 SHA-256: 74914c8aa44fd1a03cf31e7f5321b1b3d18f131812fb526f15ed65d514dbb509
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The PDF_SEO_LINK_FARM heuristic indicates the sample is designed to host numerous links, likely to distribute further malicious content or phish for credentials.

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://jacksth.ru/award?keyword=glory+and+praise+to+our+god+chords+pdf
    • https://gedexezesojefib.weebly.com/uploads/1/3/4/6/134666283/kesisemudo_fujan.pdf
    • http://dorightunion.com/bushnell_tour_v2_slope_manualsrkui.pdf
    • https://tapizijivuvol.weebly.com/uploads/1/3/2/6/132696465/zejatiwuwowu.pdf
    • http://wimudevereru.sportsontheweb.net/adobe_pro_10.pdf
    • https://cdn-cms.f-static.net/uploads/4371509/normal_6033368704b69.pdf
    • https://static.s123-cdn-static.com/uploads/4470228/normal_5fdfd8ec18202.pdf
    • http://gavolav.mywebcommunity.org/etica_aristoteles_livro.pdf
    • https://zibaxewax.weebly.com/uploads/1/3/4/6/134699960/9430faa3e0f7b.pdf
    • http://haifaiv.ru/zonafogilozilojawezomuwx8p.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_02ffc01a50884855a0829da795b29684.pdf?index=true
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_c9d7e941d3a84e288ad097ec30c6ff6f.pdf?index=true
    • https://s3.amazonaws.com/nonipesikiri/xaxatobige.pdf
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_de305e0baa82473f9ef4361c71a0ebb8.pdf?index=true
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_2e82c9e55b9c4c0f892db6cf8894cf4e.pdf?index=true
    • http://mifotabelimudon.myartsonline.com/64410407816.pdf
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_8c8a76b1ce114bd889155433b03d179e.pdf?index=true
    • https://s3.amazonaws.com/gixawetopoli/wutunugozuvemuselenesufu.pdf
    • 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_off0000e817.bin
a816342bff7f43eb59beb5154fd1a0fd21cae8253f5c25db36125380ec70cf36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 5548 bytes
font_01_sfnt_off0000fafe.bin
ff2a3279b5b879cd3fa91db1d532f66d4025686fc58085e9ea8f79bbfe6b8b0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 10392 bytes

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