Malicious PDF — malware analysis report

Static analysis result for SHA-256 f495f21d953f9032…

MALICIOUS

PDF

75.4 KB Created: 2020-11-22 01:14:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5c9659ef38ad441f916e94d5cc3f0f23 SHA-1: d38905d61dc48bf058a341244129a3099ef57f3a SHA-256: f495f21d953f903272dedfe86270c21d1abd7bae6d515bc8614046e2e827f072
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://cctraff.ru/aws?utm_term=free+indesign+flyer+templates In PDF document text
    • https://munujagafunudo.weebly.com/uploads/1/3/0/8/130873736/neviz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375207/normal_5fb45319a0195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374532/normal_5f95d49167b26.pdfIn PDF document text
    • https://nirumoxizexajiv.weebly.com/uploads/1/3/4/5/134524745/bojowokol.pdfIn PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/2b0e30652af90.pdfIn PDF document text
    • https://ranenowubugipo.weebly.com/uploads/1/3/4/0/134040983/jupew.pdfIn PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/2676791.pdfIn PDF document text
    • https://guxitubekin.weebly.com/uploads/1/3/4/2/134267073/453691.pdfIn PDF document text
    • https://ramujodavuratot.weebly.com/uploads/1/3/4/6/134667495/nuxasubefezesexejeba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/ombre_formal_dresses_plus_size.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/65166188701.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/fajimokojagef.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/azur_lane_pvp.pdfIn PDF document text
    • https://s3.amazonaws.com/wepeliniru/revdl_gangstar_vegas_mega_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/bise_lahore_result_app.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 5096 bytes
SHA-256: 5e7b5c861f3b754e2560e3d45200dc0bdd5d2cb87a095378388935d49f317f9a
font_01_sfnt_off0000ef0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 10340 bytes
SHA-256: b5e82b43f874c2680fe200649a2d0126d72c79ccc16fee8313fe1ff859e7f575
font_02_sfnt_off00011239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11239 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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