Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa6dba81389bca3…

MALICIOUS

PDF

81.4 KB Created: 2021-03-16 21:45:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f32327e1f959a82aea07ff4e3d4a4219 SHA-1: 592a2b0b38ae4129a06080f69a97916a76750937 SHA-256: 5fa6dba81389bca362018ed977bc1073de03f0303e6443e61f0b8a126fd843f8
186 Risk Score

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://zajinet.ru/strik?utm_term=how+to+make+bottle+experiment PDF link annotation
    • https://cdn.sqhk.co/lifupowaseli/gidhdFG/dowaridafalugemojuwanixu.pdfIn PDF document text
    • https://cdn.sqhk.co/zamodozitip/fhbjey4/candy_legend_game_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/gOvnaVe/45277379804.pdfIn PDF document text
    • http://wotodusasesode.iblogger.org/50838418800.pdfIn PDF document text
    • https://cdn.sqhk.co/kosadara/oZehioL/moxaxepifikuwa.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/je3Khd5/fanivatuxom.pdfIn PDF document text
    • https://galanopudaxu.weebly.com/uploads/1/3/4/1/134109153/nebis_jaker.pdfIn PDF document text
    • https://cdn.sqhk.co/zebapomiz/m4FlKqz/92633332864.pdfIn PDF document text
    • https://witaretazijaw.weebly.com/uploads/1/3/0/8/130813730/vubogeju_nesozusu.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/hiNbiah/battleheart_legacy_vs_battleheart_2.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/gjljdih/77767058095.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/jhCigjF/smashing_pumpkins_songs_list.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/ieaAhbS/freelance_invoice_template_canada.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://fijinibegomiba.rf.gd/dadivika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac37c53-0463-4c21-9881-1f97e3cd1f93/11008326303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11394a4c-7f09-4abb-8f63-97146781a2b8/49308059313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/161376cf-1044-4401-a27a-ca5910ddea49/90366295026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/047ddf9a-1eed-4218-a89e-400b9dc5b626/17177935828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a04db308-b1bf-4ce6-beef-34a6fbde0292/how_much_does_best_buy_charge_to_fix_a_computer.pdfIn PDF document text
    • http://xizuxevefup.rf.gd/photo_apps_2018_jio.pdfIn PDF document text
    • http://wosepejodobedaf.epizy.com/cg_full_movie_website.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4c17019-2494-4e29-bdb5-0d946315900b/4799564003.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_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 4900 bytes
SHA-256: e1edde4301529272e3f5696d93bb1b91e8c4b877756ba5c069887507f4c2c999
font_01_sfnt_off00010239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10239 12056 bytes
SHA-256: 50800e403478d74389882b1fab0adb1062a4b0bcf8e14c04066f306813a65a1e
font_02_sfnt_off000129cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3