Malicious PDF — malware analysis report

Static analysis result for SHA-256 238711a38d450e55…

MALICIOUS

PDF

67.4 KB Created: 2020-11-23 14:59:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ebfd8abdc7c4d348576ba4860fa80b07 SHA-1: d4f2fe3ca5637001f8176fe753bf9999d9e53e33 SHA-256: 238711a38d450e55b1ccbd15dbbb451b1997374ad97b89c17c8303718b8b8e4a
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The heuristic firings indicate this PDF is designed to link to external malicious infrastructure, likely for phishing or to serve as a landing page for further malware. No scripts were extracted, but the primary attack vector appears to be the extensive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ggtraff.ru/strik?utm_term=remove+shellac+at+home In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370540/normal_5f8948950b14d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_5fa382428e2b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475861/normal_5fa9af1371d3a.pdfIn PDF document text
    • https://boruwimuruliv.weebly.com/uploads/1/3/4/8/134875556/7968390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382643/normal_5f9e8ed7eaa00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482882/normal_5fb8a3cd817bd.pdfIn PDF document text
    • https://somuwozav.weebly.com/uploads/1/3/4/5/134525430/sasolumejapejow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e30e8af7-d7a5-405b-953a-4fe407a622b5/l_ouvrier_et_la_kolkhozienne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35d2106e-2795-418c-8404-b128b8274b03/18567655979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3688ec83-5735-407a-9a18-13c2df7c5da6/nfs_most_wanted_cracked.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/gusinoluvitumisurad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81956f1-bc36-465c-87b9-ac8590b51fe0/25533980441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/124acfda-993c-4282-bfbf-99afac6426d7/vodujuwubobobalegemokup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc21b284-aa8b-4685-8820-ef4a8a6e43a3/76557893609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56817c92-3751-4ad6-be72-fcbd506fd70f/un_curso_de_milagros_leccion_del_dia.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_off0000cc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7F 5008 bytes
SHA-256: 478957c8bb31d7cbf1b12bd374182fe52f2c53a26839e7d38b06917ca55897e1
font_01_sfnt_off0000dd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 10424 bytes
SHA-256: d6948a0391400a3cb86997c1faf9ba4a03645b948d15ecd1f72900e046b2e14c

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