Malicious PDF — malware analysis report

Static analysis result for SHA-256 9386bcf6baaca0f8…

MALICIOUS

PDF

78.2 KB Created: 2021-04-07 00:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a18468617f0431665f0da10bb69ba9ae SHA-1: b45de1e8f5238fe6eb13b4456ce72908bf4024de SHA-256: 9386bcf6baaca0f8fe18367ace5de595354dcec1bae1b82123611a43c6de1a1c
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 potential SEO link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely aiming to redirect users to potentially harmful websites.

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://ponafet.ru/award?keyword=astm+e831+14+pdf
    • http://vutajazelige.medianewsonline.com/capsicum_annuum_taxonomy.pdf
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/dulani.pdf
    • https://rokawutavepuma.weebly.com/uploads/1/3/0/7/130776645/vogaduduji-pejapusogomido-sevakonaka.pdf
    • https://static.s123-cdn-static.com/uploads/4415518/normal_5fef19305ea18.pdf
    • http://gepanukotex.getenjoyment.net/29305268563.pdf
    • https://bajekilirevi.weebly.com/uploads/1/3/4/8/134868337/4682924.pdf
    • http://roxedizusugu.mywebcommunity.org/microbial_genetics_textbook.pdf
    • https://static.s123-cdn-static.com/uploads/4390638/normal_5ff90385dbb4f.pdf
    • https://cdn-cms.f-static.net/uploads/4485587/normal_600eadda6595a.pdf
    • http://rijewomel.scienceontheweb.net/kidatumov.pdf
    • https://fezuxikazosulav.weebly.com/uploads/1/3/1/3/131398093/tewazofizerifa-suxal.pdf
    • https://static.s123-cdn-static.com/uploads/4417128/normal_5ff0446dc0ea3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_20c6d7fb6d1746b586f69f308c71431c.pdf?index=true
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_9238922fdf454aeaaabf414792ff2eae.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8a8f83f2-07b2-464c-a623-09c7048a8608/zevufiduvamipuvarikoguxup.pdf
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_c699cf38b9084d75bd29c44157f9bd4d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/49c7c0e5-bc71-457c-8666-0035bc61a7aa/samsung_wf210anw_xaa_manual.pdf
    • http://zesugipove.onlinewebshop.net/wanope.pdf
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_feb3f95d1b9f44f28af466ff4aaf059c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/021a5b45-1dbd-4708-b1b7-0f0940f860c8/sample_sermon_outline_format.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_off0000f1a4.bin
468b17cea9d5c0fba5e42fd151b482445588425deb462f2e72debbae6a279dbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 5336 bytes
font_01_sfnt_off000103d1.bin
ece92569cc47074aa822ec7612e8ca461496be258ddb0deb6a60f1b581f7cc93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 11396 bytes

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