Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8ce3ec7e34cbe4…

MALICIOUS

PDF

72.2 KB Created: 2021-02-24 13:45:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bfc8c018c4cc507f29d8d9640fafbd73 SHA-1: 8c57727801fa8d7cac773e2556a834ed1edc23f8 SHA-256: 4c8ce3ec7e34cbe4c7308a370d9b735d69e80826fa883824690f5f012e1d4365
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, but the primary malicious activity appears to be the extensive use of external URLs for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=iso+9001+certified+training PDF link annotation
    • https://cdn.sqhk.co/wadupaxi/eXaouii/50547163943.pdfIn PDF document text
    • https://xasirazabad.weebly.com/uploads/1/3/4/6/134699738/ddc5ebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_601b516ea32e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_5fe705655a721.pdfIn PDF document text
    • https://toruruxixe.weebly.com/uploads/1/3/4/6/134698343/3f6815130f92ea0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455886/normal_6018b479b6754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413712/normal_60296b0403d4e.pdfIn PDF document text
    • https://monowulesamewul.weebly.com/uploads/1/3/2/6/132682048/d3a5e16ee28c5.pdfIn PDF document text
    • http://djami.ru/selodazuvomulisupajiq0drr.pdfIn PDF document text
    • https://rimemukevip.weebly.com/uploads/1/3/4/3/134318995/5412181.pdfIn PDF document text
    • http://begemotiks.fun/marketing_and_communications_manager_job_description_sampleurems.pdfIn PDF document text
    • https://gobebirerelimi.weebly.com/uploads/1/3/4/6/134651667/binabefanujo_rejare.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/hb3DbGi/tozonasofezikemakadufar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411252/normal_5fcf12f2beb9e.pdfIn PDF document text
    • http://cardioactiveuficiale.site/pubozufufumixamafefis0y8in.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
    • 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_off0000d056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD056 5232 bytes
SHA-256: 349ee967cf199eeab13d9e1b9e278bc43704653c854d3b4e620293ab556681e5
font_01_sfnt_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 10576 bytes
SHA-256: 5bd251b137b955fde7f47b55791cbfa02dfa0e0214ee2532ef0fc54590aa1b97
font_02_sfnt_off00010607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10607 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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