Malicious PDF — malware analysis report

Static analysis result for SHA-256 89596ba2646ecc9f…

MALICIOUS

PDF

77.8 KB Created: 2021-03-13 20:09:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77a4a5184e6a1b89975ac51c8bb6422a SHA-1: 19a7e0eff96fff808c49df3de8c548f82478d2fc SHA-256: 89596ba2646ecc9f27b530ccf91629503c097449149749479a2240dde92b5cc0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to other PDF documents. The primary external URI, https://maypoin.ru/award?keyword=que+es+la+certificacion+leed+pdf, suggests a potential phishing or SEO spamming campaign. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://maypoin.ru/award?keyword=que+es+la+certificacion+leed+pdf
    • https://cdn-cms.f-static.net/uploads/4471455/normal_6029254c314ae.pdf
    • https://cdn-cms.f-static.net/uploads/4378171/normal_6044d98217cfe.pdf
    • https://tunoritusaw.weebly.com/uploads/1/3/5/3/135328070/ad39d1d36a1.pdf
    • https://cdn-cms.f-static.net/uploads/4412999/normal_6044f68e75fdd.pdf
    • https://sezivokup.weebly.com/uploads/1/3/5/3/135318733/sutexexe.pdf
    • https://xaxusirawo.weebly.com/uploads/1/3/4/3/134318026/powejonu-rirufapakumog-rowexi-fogiwaz.pdf
    • https://static.s123-cdn-static.com/uploads/4482629/normal_5fe0b157957e5.pdf
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/sosokopolufosokew.pdf
    • https://nozojotama.weebly.com/uploads/1/3/4/5/134585139/8398148.pdf
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/3228091.pdf
    • https://kenibojowosude.weebly.com/uploads/1/3/5/3/135324683/334381c76ac.pdf
    • https://cdn-cms.f-static.net/uploads/4393641/normal_5fdb1b7563aee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_e7c9041a257543c894614725bc4d6197.pdf?index=true
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_f062fbe026724188a5472b57551d9048.pdf?index=true
    • https://badbb018-ab4e-499b-b788-960949b82e3d.filesusr.com/ugd/4f4c56_e1c9f323ada0409bb1107b2120033e54.pdf?index=true
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_6d7ea50f38834794bfbb45f691ca3789.pdf?index=true
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_d77c53773088483a863280a948bd8881.pdf?index=true
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_6a81f3fcabde4ff193e53aa55c34d411.pdf?index=true
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_464f2850ede74d34978de14c7dce7dfc.pdf?index=true
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_99fa864d78474b10b065c252c0b1ac71.pdf?index=true
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_3212cba95af34ecb84a871bff0752bc2.pdf?index=true
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_7dc0e4eafcbf469ab49ec289c856e7e3.pdf?index=true
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_9aebf90911dc4d9f8ab7ac17645018ee.pdf?index=true
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_b3f0bff3e9c64f70beced94eb05a88bd.pdf?index=true
    • https://21dbc830-6d60-48ad-8ab0-00d2b3cb69e0.filesusr.com/ugd/18d949_11b63d563aa04728bda9fbf0979d6c09.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_off0000efd2.bin
c19ae15fa15af0a5384c73e3bef20b85a29f5ce76ce5a411ceafa37e7e11c602		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 5212 bytes
font_01_sfnt_off00010196.bin
e3ac6e6210bcfde4362856719b7b0da81e505294f318b15c65d1fa3f4f9ab370		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 11740 bytes

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