Malicious PDF — malware analysis report

Static analysis result for SHA-256 c839a82d055fedfe…

MALICIOUS

PDF

75.6 KB Created: 2021-03-30 23:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 44d06acf73a211595d56cf262cd2ed89 SHA-1: 8ee9f4877bfaa736dd603cedb74053156274a664 SHA-256: c839a82d055fedfe09632285097cfc4caa7032da9faf5cef0650a4d56b8d66a2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jottigo.ru/wix?keyword=unlockmytv+apk+android+tablet PDF link annotation
    • https://valowitezud.weebly.com/uploads/1/3/5/9/135993777/jelijazewujanogapot.pdfIn PDF document text
    • https://cdn.sqhk.co/tejurorado/iMZhdSV/86371374597.pdfIn PDF document text
    • https://zekaxuwamawebi.weebly.com/uploads/1/3/5/9/135961115/acf13400a5c422e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417413/normal_5fcb4a46ae9dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421038/normal_601c752d61902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419441/normal_604804858aa7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_605f4b0db52cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404730/normal_603f09c1bbfa3.pdfIn PDF document text
    • https://mipikarekegimo.weebly.com/uploads/1/3/1/6/131606279/6737140160a110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489601/normal_60189f605a9cc.pdfIn PDF document text
    • https://cdn.sqhk.co/gorubabor/7Dhiejh/6091116490.pdfIn PDF document text
    • https://cdn.sqhk.co/bunigenozav/esjbhaR/ziggy_zagga_new_gen_halilintar_piano_tiles_online.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/iwhgFif/56105925029.pdfIn PDF document text
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/6424677.pdfIn PDF document text
    • https://zewalomoweso.weebly.com/uploads/1/3/4/5/134588134/2505645.pdfIn PDF document text
    • https://woxoxoba.weebly.com/uploads/1/3/4/8/134893248/9b624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470222/normal_603ecd7c4ebc9.pdfIn PDF document text
    • https://cdn.sqhk.co/faxinomitux/cjcjjhg/plantar_wart_root_sticking_out.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/esCgdgd/deadly_medieval_arena_mod_apk.pdfIn PDF document text
    • https://topirameji.weebly.com/uploads/1/3/2/6/132682330/9cb83b79018d45.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/S5ggjb7/business_accounting_services_warwick_ltd.pdfIn PDF document text
    • https://raguwamirib.weebly.com/uploads/1/3/4/6/134630778/5887294.pdfIn PDF document text
    • https://cdn.sqhk.co/rozamulev/Blihhh4/pozafujamizejif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 5396 bytes
SHA-256: 5c5985a754ece2ed74326587d570afd51ae594ce5afcf964029f6389205c69e6
font_01_sfnt_off0000fa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 11344 bytes
SHA-256: e0c95a97a9e346db1256402ed2195685cf96e4e5d2e8cdc1391601545b6d3c0a

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