Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ed91699b2a01fb…

MALICIOUS

PDF

163.8 KB Created: 2021-02-26 01:06:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7e35d6da322afcc6c4ad2a5e79600ab3 SHA-1: ed03dd2ff7f0f42c75ca59c4e86e24370478ef86 SHA-256: e7ed91699b2a01fb6761eb564ee3d4051fd87abdf74adf2ca2a132d890d6ee6e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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://druttle.ru/123?utm_term=trig+proof+identities+list PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490523/normal_5fd04521acc66.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojonujaj/jDifRhj/42483799121.pdfIn PDF document text
    • https://wamogipoko.weebly.com/uploads/1/3/0/7/130739383/e1a37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_60240935275fe.pdfIn PDF document text
    • https://kefepifumadig.weebly.com/uploads/1/3/1/3/131383651/60bd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_6025f53a529cb.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/how_to_prepare_for_an_office_administrator_interview.pdfIn PDF document text
    • https://duzetokip.weebly.com/uploads/1/3/4/4/134404829/ranonaj.pdfIn PDF document text
    • https://vumetubav.weebly.com/uploads/1/3/0/7/130776444/1f539da7a3082.pdfIn PDF document text
    • http://sevazumemozoli.22web.org/cod_big_red_one_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dovuxomumebajip.epizy.com/80724369812.pdfIn PDF document text
    • http://vafikozokus.rf.gd/what_does_cigar_ring_size_mean.pdfIn PDF document text
    • http://vigevelo.rf.gd/18502625216.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22584 4948 bytes
SHA-256: f22028fc815c62709db3179c939e2875c210ee1b2e7c441d32f30966a29722ff
font_01_sfnt_off00023672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23672 15208 bytes
SHA-256: d0917077133e7a83546170df14160c67de11382bd1381b3545b4f037d21fed52
font_02_sfnt_off000268df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x268DF 17088 bytes
SHA-256: 0c9d80aa5e97140c4981e18f0d9eb2dfe6226810f02b691519824424b6928fab

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