Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ccbf90ccec35eb…

MALICIOUS

PDF

77.7 KB Created: 2021-02-19 18:35:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7b7d0a16ffc4f5e8173f730537c80986 SHA-1: 5c3a6f6e3fb13576336f619dd9fa45c04c76d8e1 SHA-256: 98ccbf90ccec35eb30968dae8378088afe5ae1089582e9c4666a5372c234620d
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://crophysi.ru/123?utm_term=how+many+times+a+day+should+you+use+the+waterpik PDF link annotation
    • https://cdn.sqhk.co/xorilulog/geUiaku/xavaduzedu.pdfIn PDF document text
    • https://guvoladedesu.weebly.com/uploads/1/3/1/4/131453897/585cde8f1e.pdfIn PDF document text
    • https://sosepokapebovi.weebly.com/uploads/1/3/0/8/130814645/1003329.pdfIn PDF document text
    • http://kersita.fun/manual_de_analise_de_dados_faverolz4ru.pdfIn PDF document text
    • http://bella24.xyz/verizon_wireless_mifi_unlimited_planldm8o.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/560160.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394079/normal_5fe543d86454c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5fe8cc3211b83.pdfIn PDF document text
    • https://talotemeve.weebly.com/uploads/1/3/1/6/131606578/pewanivekuxim.pdfIn PDF document text
    • http://eroganoficial.site/bsbadm307_organise_schedules_answersd7lg2.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/2jDhc08/king_herod_bible_wiki.pdfIn PDF document text
    • https://nalufubuxozukex.weebly.com/uploads/1/3/4/4/134479837/lejizuxol.pdfIn PDF document text
    • http://kernig.pro/881020569190m02p.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/vedexajawo/rutusilapupoxekelavox.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/live_nettv_apk_free_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/65816017710.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_off0000f12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12E 5416 bytes
SHA-256: ecdd39570a11132886cb5ede1f55b462379d2e37cd1577baed662b09ab17299b
font_01_sfnt_off0001037e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037E 11200 bytes
SHA-256: 6f33f21656b65742ae0d9a8c7de1a79fe3de5efd5323ee9b56a2ec90b7220780