Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea87e50f086fd38f…

MALICIOUS

PDF

71.0 KB Created: 2021-02-11 16:15:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 809013371bca2ea2c338340a0c853bf3 SHA-1: b65c40d6c6bd255e9ddfae3d7ef8007e027c4426 SHA-256: ea87e50f086fd38fbe7adfa037374bc82ed4a73cbfb764e5e6decd94a845301f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/aws?utm_term=arabic+dictionary+app+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464873/normal_601554473eed1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408180/normal_600577657d1ca.pdfIn PDF document text
    • http://gemobaraza.iblogger.org/formato_para_certificado_medico_imss.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403273/normal_5fe4d9299a1c2.pdfIn PDF document text
    • https://lerasakob.weebly.com/uploads/1/3/2/6/132682990/5527062.pdfIn PDF document text
    • https://banukusisazej.weebly.com/uploads/1/3/4/8/134893357/dolunuvejanekifeni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450512/normal_5fe96f93af066.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370092/normal_5ffed1ff3bc31.pdfIn PDF document text
    • https://cdn.sqhk.co/xidodaxu/jhgCifg/find_my_iphone_icloud_turn_off.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/nonabafat/decimalformat_2_decimal_places.pdfIn PDF document text
    • http://nulabede.epizy.com/windows_10_latest_stable_build.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/31095625845.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/somatofonigil.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/formative_assessment_art_and_design.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_off0000d856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD856 5088 bytes
SHA-256: 6cbc35c6571caa24e8135b4fe7cc9bc48cfd45978f27179c4bdef9c6308095d5
font_01_sfnt_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 10988 bytes
SHA-256: 3a1c2c96c200baddb34874c46cd3f5d8013644588eb80bfb22d0fc13b69971d2

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