Malicious PDF — malware analysis report

Static analysis result for SHA-256 5421d0f47082c2c0…

MALICIOUS

PDF

71.8 KB Created: 2021-03-27 20:31:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e66e1a09e148ce00eb4b3febfb792f7 SHA-1: edb0cb4bcd53f357b018a34c7aebf94779038561 SHA-256: 5421d0f47082c2c096957fa16bd8bcd9efe8302b8aed6fb302dbe7477c97807f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL, https://botokaw.ru/award?keyword=basic+electronics+notes+pdf+vtu, suggests a lure to disguise the malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan', reinforcing the malicious classification. The file's purpose appears to be directing users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/award?keyword=basic+electronics+notes+pdf+vtu
    • https://cdn-cms.f-static.net/uploads/4454677/normal_6046e7dd8f717.pdf
    • https://cdn-cms.f-static.net/uploads/4449627/normal_605949cc39f1d.pdf
    • https://cdn-cms.f-static.net/uploads/4367279/normal_600de0a7ef4e3.pdf
    • https://tokegomobox.weebly.com/uploads/1/3/4/3/134314144/nelenupugevigeg.pdf
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/suzavopexafop_luwusowisutaz.pdf
    • https://degadita.weebly.com/uploads/1/3/5/9/135965793/9718082.pdf
    • https://static.s123-cdn-static.com/uploads/4446773/normal_5ffcd597ee529.pdf
    • https://cdn-cms.f-static.net/uploads/4499285/normal_603dd26e60b37.pdf
    • http://figimumagoko.mygamesonline.org/que_es_el_gnosticismo.pdf
    • https://xulewanexu.weebly.com/uploads/1/3/4/1/134108589/ab035a.pdf
    • http://xufelaketodo.getenjoyment.net/37636060157.pdf
    • http://zuxekagapefe.mygamesonline.org/surah_yaseen_with_urdu_and_english_translation.pdf
    • https://tupodawemizaz.weebly.com/uploads/1/3/4/5/134594588/4453560.pdf
    • https://cdn-cms.f-static.net/uploads/4447497/normal_6026770c3fc54.pdf
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5fd0c476acc95.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bujekotu.atwebpages.com/48782640421.pdf
    • http://juludiripo.myartsonline.com/50006771130.pdf
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_731d0abb00904c5b8905157a4b5ab334.pdf?index=true
    • https://cc67bef4-e22e-42fd-bf01-3f02b15f800b.filesusr.com/ugd/080020_852cee384239408fb512cd4166371d4e.pdf?index=true
    • http://matewedidoxeber.onlinewebshop.net/beethoven_sonata_no._30_in_e_major_op._109.pdf
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_a5db7287ba3c40609fb1687d27d1bcaa.pdf?index=true
    • http://saxarivoje.onlinewebshop.net/sokaduxuneka.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_off0000db8d.bin
af0b7c3393ae4052715cbc0599c861ef2f29ee2ec004b6d9884dbe619d3c12cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8D 5256 bytes
font_01_sfnt_off0000ed85.bin
0b8c2f4411496884e57f15f0279a39cf1e8baa048915d8666b4bf83ed42d12b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 10532 bytes

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