Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b7974c1066be85…

MALICIOUS

PDF

79.4 KB Created: 2021-01-19 03:44:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d55f04687c06519f68fd6cf89284f4c9 SHA-1: 9484e3df068e7f7765bcf341413663b4be08b32b SHA-256: b3b7974c1066be8573a5e422287682374e62c4d9ca6e0c5e35b41fa998fe8728
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. 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-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://traffnew.ru/123?utm_term=libro+de+la+devoci%25C3%25B3n+a+la+preciosa+sangre+de+nuestro+se%25C3%25B1or+jesucristo PDF link annotation
    • https://cdn.sqhk.co/rabuzopat/hbNThbz/74827877684.pdfIn PDF document text
    • https://komeregin.weebly.com/uploads/1/3/4/7/134732401/4975565d22e0a19.pdfIn PDF document text
    • https://xefomivor.weebly.com/uploads/1/3/0/8/130814633/rodun.pdfIn PDF document text
    • https://site-1177229.mozfiles.com/files/1177229/spider_solitaire_collection_free_windows_7.pdfIn PDF document text
    • https://site-1175951.mozfiles.com/files/1175951/baduxutif.pdfIn PDF document text
    • https://site-1180648.mozfiles.com/files/1180648/64611974477.pdfIn PDF document text
    • https://cdn.sqhk.co/vefutifeves/gczle02/62155394154.pdfIn PDF document text
    • https://site-1253089.mozfiles.com/files/1253089/19548832116.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/32e063a95e.pdfIn PDF document text
    • https://cdn.sqhk.co/dujuxafetot/WpFjivW/bird_of_paradise_flower_colors.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
    • http://nareboveridur.epizy.com/67347212912.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/texas_elementary_curriculum_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/honor_view_20_amazon_quiz_answers.pdfIn PDF document text
    • http://giratas.epizy.com/dezigaporadasufepijakuje.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/2017_toyota_highlander_repair_manual.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BE 5688 bytes
SHA-256: bab1e20cc02291b04020799b132300b263be8524c034c3e62ab3a3758220e370
font_01_sfnt_off0000f9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 11384 bytes
SHA-256: 58b613badae7a3c52bdc12d2757f54f25edc76ef76f6aae44e46f4e5679fa150
font_02_sfnt_off00011ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC7 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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