Malicious PDF — malware analysis report

Static analysis result for SHA-256 66af84734f32b5f4…

MALICIOUS

PDF

109.3 KB Created: 2021-03-20 06:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0d828730b87f4fcd01db4ddde49cc94e SHA-1: af0d38a8e947d7a20f2cacf57f15d68970b8db3c SHA-256: 66af84734f32b5f405918ea6c1920f59c9d5c9b0432de49917886a2849a3b70f
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The document body, though heavily obfuscated, contains text that could be interpreted as a lure for answers, aligning with the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/wix?keyword=capitulo+6a-6+answers In PDF document text
    • http://ca-manalapan.space/xagukakelisujoderopelom98766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369146/normal_6033be6ec72d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_60450a0f6b48b.pdfIn PDF document text
    • http://wowitaly.pro/fegubuxusogozabehcwss.pdfIn PDF document text
    • http://skidki-day.shop/lunadizumubasivonuzoga2dm44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477167/normal_6041e65592ec9.pdfIn PDF document text
    • http://lishop.site/54505992345s8tsh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383565/normal_5fcbdaaaa25d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451355/normal_604b2a3867ba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483361/normal_603649169563f.pdfIn PDF document text
    • http://digtalcaliper09.xyz/28888353058nfw1k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_60208c1c41fe5.pdfIn PDF document text
    • http://setofexperience.site/que_significa_okana_shexheh7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391308/normal_6017b75571be2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469143/normal_5fed6d5131b99.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/zubuwujoxom/62972592864.pdfIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_eabe305e9f2a4b34bf1156212fbe6dd1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugumeb/yfn_lucci_dream.pdfIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_e2f799b9b1274919a0d8bb0797fa913a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvarelo/52702959544.pdfIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_f19c55c75fb9478eb195e94a0416e45e.pdf?index=trueIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_683c74bae71f4b69b83c7cb71cae70bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xojafemori/odia_dj_dance_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/96085618343.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_off00016911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16911 4996 bytes
SHA-256: fd3ca2e5b9ce30b05e023ae794431b23bf770f74dd4509a2cd1e6bb9f446fb3a
font_01_sfnt_off00017a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A2D 14072 bytes
SHA-256: a82ff86a9f850388968ea9ba9e70a2984ef538e9b9442b373acece06365788ed

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