Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88b3367a211053c…

MALICIOUS

PDF

71.9 KB Created: 2021-04-05 15:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0b0e8b41d484a62cba9e92215f058fdd SHA-1: 0b504b5561154cb41f3a483da3f39dbb94d848d1 SHA-256: b88b3367a211053c71e55fd537ce7cc7bff3b730eb1f83cc0245a4713ba83672
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 0.9991

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://leonvi.ru/strik?utm_term=how+to+play+power+of+love+huey+lewis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372967/normal_600aa49892dce.pdfIn PDF document text
    • http://dolobovofozuz.22web.org/zexuvipifupifazibaset.pdfIn PDF document text
    • http://nulatapukedu.scienceontheweb.net/sewufipilebuwise.pdfIn PDF document text
    • http://vojirumabi.22web.org/free_printable_venn_diagram_template_with_lines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450731/normal_5fdc7674981d6.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/what_does_audacity_mean_in_a_sentence.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465400/normal_5ff9fae12309a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485152/normal_5fe00286b9131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485695/normal_5fdc09bd88a7a.pdfIn PDF document text
    • https://vesodadetuvi.weebly.com/uploads/1/3/2/7/132740638/naramolav_fexoros_jadevuf.pdfIn PDF document text
    • https://pigakuri.weebly.com/uploads/1/3/4/6/134684466/xefaxuk.pdfIn PDF document text
    • https://xenoxitirup.weebly.com/uploads/1/3/4/3/134324472/pomefo.pdfIn PDF document text
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/zivureb_fikinakimob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476002/normal_60571c7cc99cb.pdfIn PDF document text
    • https://lepamatizetu.weebly.com/uploads/1/3/0/7/130739269/zaniretijajidaxim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448718/normal_6020c16578eff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444643/normal_605022f56fdac.pdfIn PDF document text
    • http://jidugisukeranav.iblogger.org/45852240968.pdfIn PDF document text
    • http://visatog.22web.org/information_technology_department_meaning_in_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baverasoge.epizy.com/thrawn_alliances_read_online.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/what_is_the_difference_between_a_standard_and_mini_dachshund.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/mofaze.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/95955169990.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/jaybird_x3_warranty.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_off0000db5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5D 5204 bytes
SHA-256: e2973561a99562a8948d77118ecdddba3b9fb291e492b5c101a82ea603dbeaf1
font_01_sfnt_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 10780 bytes
SHA-256: c2e7e7adcdcbc2f27bf0d0bf59305f77be015b3d58b94334f7e1ad9a1702eb15