Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb1690efc3c4294…

MALICIOUS

PDF

76.5 KB Created: 2021-03-22 00:58:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9d79d9179a857679f630d6df5819c856 SHA-1: 206ab26a0caaf1bb00d5d827ad7a66e5251ec000 SHA-256: dfb1690efc3c4294a6d44301d8bdf173be6c01aecfe94293bec688a490a47312
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to download further malicious content or phish for credentials.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/123?utm_term=beep+song+tamil+lyrics PDF link annotation
    • http://dk-inc.xyz/guzexaxur6oaf.pdfIn PDF document text
    • http://gnatural.space/xepokelariwigubu1ceb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414688/normal_60330e4a1cb6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450898/normal_60216fefaeb84.pdfIn PDF document text
    • http://leaninrzpd.site/kopevokovaravkqnmw.pdfIn PDF document text
    • https://dawurawo.weebly.com/uploads/1/3/5/3/135323901/foziwipuro_balimetiba_tawexexeranoj.pdfIn PDF document text
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/fagotuluxe-wuvuguna-vaxeliwegipefog-waniwovukelojek.pdfIn PDF document text
    • http://top-agent.ru/63950529057uqrgv.pdfIn PDF document text
    • http://natorg.fun/algebra_de_baldor_pag_161_ejercicio_98_resueltohfsbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382407/normal_60113ae339aef.pdfIn PDF document text
    • https://nuzukozifazo.weebly.com/uploads/1/3/2/6/132682871/tufavedugesikisoj.pdfIn PDF document text
    • https://vunukufe.weebly.com/uploads/1/3/4/6/134640969/tojumi_nogiwope_wilaz.pdfIn PDF document text
    • http://ig-support-service.com/buxewetijoxatulgtat8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vufupu/govakatezemunimetu.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/27131613045.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/mizedij.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/tidozameregob.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 5404 bytes
SHA-256: 97233e0b275b69a42a7efd6c4de48c836b0ca310471ce32bbe49971225794ffe
font_01_sfnt_off0000ffd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD3 11028 bytes
SHA-256: 969b3156b0218babcdafce2169002c30faaa8bae85353f66ced37056016897e2

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