Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4b2ea6c4d4b41b…

MALICIOUS

PDF

103.5 KB Created: 2021-02-21 14:57:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6358d0bf6cb186176850d00c0161a116 SHA-1: 203cfa7b30f76337520deda488c62d1f06e4bdbf SHA-256: aa4b2ea6c4d4b41b867850349a1bd93d44536de5c2350159c36a2504e0451364
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to other PDF files, indicative of a link farm or SEO spamming tactic. The presence of the URL 'https://baarspo.ru/wix?keyword=unblocked+school+games+online' in the document body suggests a lure to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://baarspo.ru/wix?keyword=unblocked+school+games+online PDF link annotation
    • https://fojomuku.weebly.com/uploads/1/3/4/4/134447263/gosuvoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501654/normal_5fca0d29a8d8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404753/normal_600de5745cabd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448547/normal_5fd625abbcb1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_5fe9e6c867d8e.pdfIn PDF document text
    • http://vuxiparami.22web.org/audacity_windows_10_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378406/normal_6029a25110716.pdfIn PDF document text
    • https://renugukid.weebly.com/uploads/1/3/0/9/130969315/039a5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381094/normal_5fe42181101bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471249/normal_5ffb4c1820a13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/16529681743.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/earth_s_rotation_worksheet_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/reverse_camera_wiring_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/administracion_financiera_oscar_leon_garcia_gratis.pdfIn PDF document text
    • http://badiwofotafazol.epizy.com/anki_android_import.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA1 5160 bytes
SHA-256: 103ab82e05aeefc38a70ecb9d26754b259dad3de63f60acbcde6c70913541400
font_01_sfnt_off00015cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CEE 11068 bytes
SHA-256: 758e3119be9771d0fd937301fe65839ca265098d994d573f6e72009be3457d8c
font_02_sfnt_off000182b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182B8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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