Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac9f39c40a42421…

MALICIOUS

PDF

74.8 KB Created: 2021-03-29 16:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e33e84b4762b656ada5d136683257db6 SHA-1: 5cb9db3b1cbf4830397640b5158cb2c476e1d006 SHA-256: bac9f39c40a42421e5ddba63383a87bc2433df78d883830194f41d4c73adb2b1
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://bologen.ru/123?utm_term=kamikazee+huling+sayaw PDF link annotation
    • http://shoppingyxplus.xyz/93607956248n798a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417405/normal_602d40fc26699.pdfIn PDF document text
    • http://babudategajuzul.iblogger.org/informacion_sobre_carpincho_uruguay.pdfIn PDF document text
    • http://wowit.pro/luxijawezukuxoxivarda333.pdfIn PDF document text
    • http://dofuluxaruze.22web.org/banco_santander_sa_annual_report.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/2DjhbBl/ds202_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/Chbggib/dash_till_puff_2_mod_apk_android_1.pdfIn PDF document text
    • http://datinge.site/star_trek_online_bridge_officer_training_manual76lie.pdfIn PDF document text
    • http://bimemonok.22web.org/30936042988.pdfIn PDF document text
    • https://cdn.sqhk.co/voxobidivel/Wkhirif/strikemaster_40v_with_extra_battery.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/jicJo1T/faith_family_practice.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393889/normal_5fced70c1b4d2.pdfIn PDF document text
    • https://cdn.sqhk.co/winexumalov/bCierji/72180791159.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/napoledunadigo/sat_subject_tests_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d863ec18-805a-43a7-8e71-5d9a70393715/gukodemidisuwaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c9be2bd-0fdc-47c3-a887-ae262c3ec491/fatigaxulifurasefobe.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/xaxitejijebebeder.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_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 5280 bytes
SHA-256: 95ae985f39f614b99e3bc8f202c3505520405df50638b1a4e91b554187dee23d
font_01_sfnt_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 11348 bytes
SHA-256: fe3d333cba848cdff0c26a719c861c9313c5a802e63565f2cb42cdb6ebd58568