Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2ce4f144bb8ab6…

MALICIOUS

PDF

87.2 KB Created: 2021-04-12 08:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 77aa52d906bdaae75f69d7c2488c36f6 SHA-1: b2052eea574a0a4a375f266cefcdc8fb9109ba31 SHA-256: 9b2ce4f144bb8ab647bb430c5c7a3a1f26bed8a9ba866356715be1027aaf63ee
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 a significant number of external links, suggesting it functions as a link farm designed to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://botokaw.ru/strik?utm_term=how+many+miracles+in+matthew PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413590/normal_6013c1ce24b19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469143/normal_606b57dbc5f35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402740/normal_600ef5ac830e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421341/normal_6019d4dbda35b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408180/normal_5fc7371ff2b8a.pdfIn PDF document text
    • http://card2card-perevod24.site/5889753227bnt5h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494674/normal_605de58940ad6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501198/normal_5fdc01d313916.pdfIn PDF document text
    • http://itfamily.info/vivah_full_moviez6m0g.pdfIn PDF document text
    • http://yandex-delivery.cc/how_to_replace_filter_vicks_humidifierq3q7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481156/normal_5ffb27f26a4f4.pdfIn PDF document text
    • http://antileqphh.site/ps_vita_slim_new_ukjxh8p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415745/normal_5fee93a045dab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_4117dfcbe1b34576af960585ada68ac8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb7d94b-2408-4f8f-bb5e-264d2b8672a4/wemaboseminifesafomalaj.pdfIn PDF document text
    • https://67acb2b6-3e42-4063-a073-371cb527a15d.filesusr.com/ugd/a81d48_ef248672fae44607b0a00e13ae2bc860.pdf?index=trueIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_6e99c8fb4eb844f8af73d46f657537d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e90c6e-a3e6-45c5-99f1-2818a608b5e6/is_there_anyone_still_alive_from_white_christmas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c32e4a4-ff1b-4259-adb8-ae3a8726d02a/xogizitizaparevutoziza.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_off000119c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C7 5192 bytes
SHA-256: 91a2630c62b4377b59b1633bd889e6ce8a449894535c421b931017b5867ef1f8
font_01_sfnt_off00012b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B55 10684 bytes
SHA-256: d2a74c6428c10ba126746a6feb46f70554535f9b91057bfd567d5a47b63426d6

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