Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d869c2b843c960…

MALICIOUS

PDF

74.7 KB Created: 2021-03-19 08:26:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3e103c66f1ddcd54a644cc4ec48674bf SHA-1: 8d96d8586d0a2a97b24fd2c40209b0b1f19c4bef SHA-256: a9d869c2b843c960aed704514783853409760a5427c624fc378bc4a7888c2108
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wix?keyword=patch+%2526+tweak+pdf PDF link annotation
    • https://pedumodab.weebly.com/uploads/1/3/1/6/131637036/e8405e4ed02b.pdfIn PDF document text
    • http://bixesifebara.iblogger.org/25356375009.pdfIn PDF document text
    • https://rofasotukez.weebly.com/uploads/1/3/0/7/130740205/51e2572f2.pdfIn PDF document text
    • https://favonewe.weebly.com/uploads/1/3/2/6/132695639/3e1d80cfc08596.pdfIn PDF document text
    • https://raxipova.weebly.com/uploads/1/3/4/2/134234678/9461141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413013/normal_603d20a5ce0fb.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/f7988.pdfIn PDF document text
    • https://xabomitutopimo.weebly.com/uploads/1/3/5/9/135961599/tomexobapor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_600b3c2e3fd4b.pdfIn PDF document text
    • http://rexapeduke.66ghz.com/vidunosalowisakozeziv.pdfIn PDF document text
    • https://dijitisabotiji.weebly.com/uploads/1/3/5/3/135324222/xokixajazisu.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/poguvelefa/kafipigegejukogamupix.pdfIn PDF document text
    • http://mawabubobiniz.rf.gd/ashes_cricket_2009_wii_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/how_to_peak_and_tune_a_cobra_25_cb_radio.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/jarizozibilaw.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/12th_botany_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/21039968074.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_off0000e74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 4576 bytes
SHA-256: eb4fca1f4c4befa55ec0a36e164ab2df3aea58c59cbc36cf7e69ffef3b348103
font_01_sfnt_off0000f6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D5 11424 bytes
SHA-256: b97fdf81b1dea488c905e226d817ea00ebe00d718a1ef16bfd15b06c92fa351a