Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0c5f85dbfa952f…

MALICIOUS

PDF

78.2 KB Created: 2020-11-20 02:35:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e59708b3c50991acb07e6833691e2cd4 SHA-1: 1b6133932dcc426f6c469d0ec08028cd47df1ca9 SHA-256: ae0c5f85dbfa952fd4ebae111caa1ff33fcd18cc82ea126bbfef22ee956f89e0
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to distribute further malware. The document body appears to be obfuscated or corrupted, but the presence of numerous external links is the primary indicator of malicious activity.

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
  • 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.
  • 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.
  • 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://traffmen.ru/aws?utm_term=abcd+2+movie+songs++djpunjab In PDF document text
    • https://fevuleniwawe.weebly.com/uploads/1/3/4/4/134476097/7545e77a9795bb0.pdfIn PDF document text
    • https://danovijo.weebly.com/uploads/1/3/4/7/134774389/ralefoginawol_vedeseledobunit_kawuvi.pdfIn PDF document text
    • https://xadokefaxigewaj.weebly.com/uploads/1/3/4/3/134314424/5307257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384045/normal_5f93efce8af74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387224/normal_5fa1e287eb8b8.pdfIn PDF document text
    • https://rokumewa.weebly.com/uploads/1/3/4/5/134529377/7d49f9f6.pdfIn PDF document text
    • https://jobubati.weebly.com/uploads/1/3/1/4/131453688/d6146c6b.pdfIn PDF document text
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/f5ea7.pdfIn PDF document text
    • https://raxelapanaf.weebly.com/uploads/1/3/4/7/134746791/wovusudutepovuze.pdfIn PDF document text
    • https://mojenosude.weebly.com/uploads/1/3/1/3/131382274/7824496.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/7607131.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/mijumomub/68215616333.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/batabeguloxoxugaxupixida.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/ejemplo_de_tabla_de_contenido_apa.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_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 5660 bytes
SHA-256: 867cf516b1a44bc22a72bee5b4358a235b1a7c12e4a3da0d0765e2e5ce92ea35
font_01_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 10668 bytes
SHA-256: 03095ca4fb529a76f058035fcde9646971c743a29af8f299f4ef6f1acc52d532

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