Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc23ffcaa9ee6922…

MALICIOUS

PDF

77.4 KB Created: 2021-04-21 02:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0eacdb398cfd8174f0fd555229226693 SHA-1: 521787fc2ec055baf8d587d30336f23e15cb6bec SHA-256: bc23ffcaa9ee6922697f8d1cfac1f9aa4b50754e698dd1ced50980d815c2d86a
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 0.9997

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://xezojetit.ru/strik?utm_term=traducir+de+espa%25C3%25B1ol+a+ingles+fotos PDF link annotation
    • http://sluzhba1.net/44774392350s6yb2.pdfIn PDF document text
    • https://piluzixalevuj.weebly.com/uploads/1/3/5/3/135345731/mebile-raxagefalamegub-zapuvelobelep-tumomapi.pdfIn PDF document text
    • http://goodxday.xyz/the_lord_of_the_rings_1978_trailerr0ruq.pdfIn PDF document text
    • https://gonadasefu.weebly.com/uploads/1/3/5/3/135345348/ab8b8fd776.pdfIn PDF document text
    • https://fikuwigo.weebly.com/uploads/1/3/1/0/131071253/43007701e683e.pdfIn PDF document text
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/suferuvujaxuzamatajo.pdfIn PDF document text
    • https://bakijowo.weebly.com/uploads/1/3/4/7/134726649/wuvotivudap.pdfIn PDF document text
    • https://neseroto.weebly.com/uploads/1/3/5/3/135326238/molaxi.pdfIn PDF document text
    • https://bokefelefu.weebly.com/uploads/1/3/1/3/131383825/6430590.pdfIn PDF document text
    • https://robidolaw.weebly.com/uploads/1/3/0/7/130776002/jakotojimo.pdfIn PDF document text
    • https://karubidodofibe.weebly.com/uploads/1/3/4/3/134316277/mexenazawo-waxemunepigedew-sopixetumisam-getuk.pdfIn PDF document text
    • https://pakunifa.weebly.com/uploads/1/3/5/3/135307874/b73c360c332f.pdfIn PDF document text
    • https://lolijizaw.weebly.com/uploads/1/3/4/4/134461821/dufesepabok_rajet_sugogeluluj_pezonemofegexef.pdfIn PDF document text
    • https://tamoxukezoge.weebly.com/uploads/1/3/4/5/134585929/tiwefepedomeki-tuxumubamek-xozaviruvufufu.pdfIn PDF document text
    • http://boretibixakofer.iblogger.org/ajker_weather_report_paschim_medinipur.pdfIn PDF document text
    • http://varuvoruva.iblogger.org/92345109021.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf5aaec3-6e47-44a4-b71b-14a23c0152a0/19646014363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d1fe1fa-40e5-4e55-8694-780377bf0d20/zazalidav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a72110b2-942a-4735-8e27-cf301f7f18da/6th_grade_spelling_book_houghton_mifflin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d18ff7c-ec79-41bf-b0a8-14bc4e716c33/much_ado_about_nothing_movie_1993_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/349b40fb-83f4-4199-9c1e-9d9689aef665/un_international_law_commission_members.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_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 5484 bytes
SHA-256: 30332ba05f9ffabbeef188308820ae854d427a8cd259fb858cb53e5448f43cb6
font_01_sfnt_off0000ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 11860 bytes
SHA-256: 8227c84fd8a9772203d41423d8d09a361781397afe79b603147a31e3802f8642