Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edd4f910bf4f7e6…

MALICIOUS

PDF

60.4 KB Created: 2021-01-03 12:31:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8ad1376a2177b40fce88a200dc22ec9f SHA-1: 9b40847c61f6f23e4c450ce0e60d255d7c91ce45 SHA-256: 9edd4f910bf4f7e6d731234b5d3c0dbfc3cce605a471779764e410d71f2fb559
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to Weebly and S3-hosted PDFs, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://trafffi.ru/aws?utm_term=aisi+lagi+lagan+mp4+video', is suspicious and likely part of the malicious infrastructure. The presence of PDF_SEO_LINK_FARM heuristic indicates a deliberate attempt to create a large number of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/aws?utm_term=aisi+lagi+lagan+mp4+video PDF link annotation
    • https://voxugenones.weebly.com/uploads/1/3/1/8/131871951/e59f57.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/memumen.pdfIn PDF document text
    • https://voxonevixes.weebly.com/uploads/1/3/4/3/134383310/8252243.pdfIn PDF document text
    • https://xisovunegukizak.weebly.com/uploads/1/3/4/8/134868464/doketavili_legarozigolevi_rakep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464724/normal_5fb686836e500.pdfIn PDF document text
    • https://woruvewuz.weebly.com/uploads/1/3/4/4/134400058/xetumenekaw.pdfIn PDF document text
    • https://xutetuzaxudekit.weebly.com/uploads/1/3/4/3/134371691/2693769.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/ratixifo/7698722906.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/nipiboxoxunuzamudogezuk.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/bebiwikiwawelep.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/43447397778.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/wozepiwojiboj.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_off0000b23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23B 5320 bytes
SHA-256: 99b632a70e359e762c03f9a1fe927cda711f6cfe4f2a12252a1720e6fe241775
font_01_sfnt_off0000c45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45A 9608 bytes
SHA-256: 3d529f337664a615ab064a702caabd316e368b38a9dcc7122156b580fc5572aa

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