Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9db981240ca937f…

MALICIOUS

PDF

77.4 KB Created: 2021-03-25 11:28:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 516a418fc5c635ec49c74a55490b4939 SHA-1: 89b67564ef31be3289c8cde31f829209b52fb2c9 SHA-256: a9db981240ca937f56ebffa6c375f17b66744f1db41df06aa3ea04b54a02b8fe
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF_SEO_LINK_FARM heuristic identified a large number of external links, with one prominent example being https://kuzutuzo.ru/aws?utm_term=jump+rope+super+simple+songs+lyrics. While the document body is heavily obfuscated, the presence of numerous external links suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/aws?utm_term=jump+rope+super+simple+songs+lyrics
    • http://bonboxstudio.com/30702382404xm1ju.pdf
    • http://anyita.space/organelos_membranosos3ir9e.pdf
    • http://laithub.pro/30971904971wdnnl.pdf
    • http://fb-ig-violation.com/addie_model_template1qt1k.pdf
    • http://letnesil.xyz/form_1_plumbing_and_drainage7c0e3.pdf
    • http://bluebadgeapproval.com/heating_curve_worksheet_answers5ly7z.pdf
    • http://porn77.design/gowiwivs1w2r.pdf
    • http://50offshop.pro/615736269470eppw.pdf
    • http://jsexj.fun/donurunizivamiwugumafibu7z4q6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_b0b1246067a04dc2bf0e1505cb6cbade.pdf?index=true
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_3a525be751f4433ba1def1ccc41db7a8.pdf?index=true
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_19e43a19b79d4cfd8d6101de53942049.pdf?index=true
    • https://s3.amazonaws.com/xapijifas/gemaxojevemugifujadozateb.pdf
    • https://s3.amazonaws.com/watajive/56649872596.pdf
    • https://f8e303d0-f350-43d2-b7c3-f886ef13ec25.filesusr.com/ugd/1bb397_29f2165e9ec34d8d830773316e412f79.pdf?index=true
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_cdc17ac0935a49a48af1001412f9c023.pdf?index=true
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_30035259b71643b282192d24ea0cfea6.pdf?index=true
    • https://s3.amazonaws.com/zufojadibi/71030674047.pdf
    • https://s3.amazonaws.com/jebokizez/pinyin_pronunciation_chart.pdf
    • https://s3.amazonaws.com/bexolamabad/4780266537.pdf
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_b667cb4f9cea47cda8fccb81910629bb.pdf?index=true
    • https://s3.amazonaws.com/tokafanawa/dna_replication_labeling_worksheet_answers.pdf
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_90a4e492a35340779d19e34830cef88f.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_off0000efd5.bin
e85ae01189cd947e5083f667682deffd14f15d5af74e2d714c669b5855831e0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 5136 bytes
font_01_sfnt_off00010143.bin
7ba2d5b36ec6c28d88d2543114253a55c65689b5cf72faf67be295a455174766		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 12040 bytes

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