Malicious PDF — malware analysis report

Static analysis result for SHA-256 21968ca6ce40cb6b…

MALICIOUS

PDF

86.0 KB Created: 2021-02-20 17:20:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e10254c3cffd384249e362ca96acd13e SHA-1: d99dccec0904d4bcad92671381ed48a77400aeed SHA-256: 21968ca6ce40cb6b147221a6fb01cb42f034ee955bd29aba0c4c0a7affe47119
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'baarspo.ru' and using a 'utm_term' parameter suggesting a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of hosting multiple links on disposable domains, reinforcing the phishing or malware distribution vector. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites.

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://baarspo.ru/strik?utm_term=hoover+vacuum+cleaner+user+manuals PDF link annotation
    • https://luwagibefex.weebly.com/uploads/1/3/5/9/135966535/sitalodekesidur.pdfIn PDF document text
    • http://tonagruz.ru/875853028155i8jt.pdfIn PDF document text
    • https://jesipawuba.weebly.com/uploads/1/3/0/8/130874316/nakolavojunemesep.pdfIn PDF document text
    • http://lightly.store/91202054355eviy4.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/travels_of_ibn_battuta_mapncejc.pdfIn PDF document text
    • http://rezltml.xyz/thailand_mapsl1lh0.pdfIn PDF document text
    • http://hookup154.space/82023449367j63js.pdfIn PDF document text
    • https://dipidedi.weebly.com/uploads/1/3/2/8/132815933/39fc249f5344.pdfIn PDF document text
    • http://pearhaidhr.fun/ruwek9ymnk.pdfIn PDF document text
    • http://sodaapp.pro/penatizimukofosugilugusqqyd.pdfIn PDF document text
    • http://theandyhong.com/19147779398dstpu.pdfIn PDF document text
    • http://fruitslope.online/alapana_movie_naa_songs4lg2z.pdfIn PDF document text
    • http://vashastrahovka24.ru/how_to_export_strava_route_to_garminv00iw.pdfIn PDF document text
    • https://xajixaze.weebly.com/uploads/1/3/2/3/132302973/monopeseg.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/lonozote/fagofunenamobewimax.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/kubowabopefeta.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/48262327868.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_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 4720 bytes
SHA-256: 62b02cc80540ba543e6bb25fa6cece816a1e21453f29705e7594fbd08a43edcc
font_01_sfnt_off000116be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BE 11264 bytes
SHA-256: a5eb29c1911ce5e5498b641680ea0cff41151e4cd2858ebbf61618b707882f1b
font_02_sfnt_off00013cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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