Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c42720173a4c72…

MALICIOUS

PDF

90.8 KB Created: 2021-05-22 01:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a15eca920268d400346f0ea8c12c5601 SHA-1: d82f1b8eda0292007e810e2422d7f364094b1817 SHA-256: 47c42720173a4c72361a71d6b0c21c26aed50055b800d485f5f51ae1220e0c94
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 0.9998

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://midufefew.ru/strik?utm_term=how+to+connect+x+rocker+gaming+chair+to+ps4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458389/normal_600f869bbfc04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502245/normal_604fc3ffd1b54.pdfIn PDF document text
    • https://bifugojatomawak.weebly.com/uploads/1/3/1/4/131437093/e511d5808e4a6d7.pdfIn PDF document text
    • https://rizidapovo.weebly.com/uploads/1/3/4/3/134316848/gikujunanivibib.pdfIn PDF document text
    • https://romijefovakom.weebly.com/uploads/1/3/1/4/131454567/8714014.pdfIn PDF document text
    • https://gerikolobel.weebly.com/uploads/1/3/1/3/131398187/c51dba38e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488092/normal_6004bb4d7c742.pdfIn PDF document text
    • https://jizesemud.weebly.com/uploads/1/3/2/7/132710762/d79addc45b209b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485570/normal_60662ccae2ae5.pdfIn PDF document text
    • https://kebuwusatame.weebly.com/uploads/1/3/5/3/135343151/3817045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470221/normal_60653e9fc1a79.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/56eeabdd-1445-4363-aafc-f7ad81aad94a/disney_california_adventure_park_map_2001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/640805ad-57c1-4917-97e8-ac95cd44ad8b/to_kill_a_mockingbird_blackout_poetry_pages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ca8c00-9934-4b59-a6a0-c15b9e1ab541/give_me_liberty_ch_17_outline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4588f7b2-b914-494e-89a5-3b6963ad589a/stc_1000_thermostat_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c90dd880-8d41-4935-b405-5f2a2484edfb/dewalt_dw734_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49430a60-c50f-4dc2-bbfd-dfff0afdde6e/codigo_civil_de_puerto_rico_2020_aborto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7abdf3d-179a-4824-b7aa-329c1541c851/xfinity_x1_modem_specs.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_off00012620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12620 5588 bytes
SHA-256: 3fc4aa8c6ede0c34ed45defb70e287aefaf1e34566d4c900b81f1ed3984f90a2
font_01_sfnt_off00013916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13916 10740 bytes
SHA-256: 32207ed36c918399b3992646686f2a015763ed2554911c6904d2c99f38d54309