Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b00ec231f0bbd4…

MALICIOUS

PDF

67.9 KB Created: 2021-03-04 20:49:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d4c8d1affab401fa3d803fc951682c99 SHA-1: 39bc7ae6911537f3df056abc5ec267808847b055 SHA-256: f4b00ec231f0bbd43dc32ae736f494f26853ade6d7d5602e40a12319904a168f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier strongly indicated maliciousness. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://fokemale.ru/123?utm_term=how+do+i+change+the+audio+output+on+my+samsung+s10 PDF link annotation
    • http://ergors.space/60413230769e1nh7.pdfIn PDF document text
    • http://consequences.space/gitezusatalolbruoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490936/normal_5fd7b3cfdc773.pdfIn PDF document text
    • https://bisojobiregabo.weebly.com/uploads/1/3/4/5/134509607/2926aa425dc81.pdfIn PDF document text
    • http://streamsweets.com/roworupiwalofanuwduke5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464873/normal_603f662de8f10.pdfIn PDF document text
    • https://xutepokukofegik.weebly.com/uploads/1/3/5/3/135391302/c4e6b076a018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503787/normal_5fc609e872d86.pdfIn PDF document text
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/wumikin_navum.pdfIn PDF document text
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/xawasizidusixa.pdfIn PDF document text
    • http://krokoboko3.xyz/brave_frontier_female_charactersa26gp.pdfIn PDF document text
    • https://ponebivilu.weebly.com/uploads/1/3/4/5/134505494/1659411.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://runesufosufej.rf.gd/the_oaks_primary_school_ipswich_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/getinok.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/85323831551.pdfIn PDF document text
    • http://letozin.rf.gd/rujadapisodiwilatodena.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/manchester_academy_high_school_ofsted_report.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_off0000cc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC29 5708 bytes
SHA-256: d9bfc7de8330b450a151d0ba729ec103deaf1bbe8de31388e89eaa93a1c15d91
font_01_sfnt_off0000df93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF93 10164 bytes
SHA-256: 7e873d542c8a0f87a1e82dc5219a53a3d38572fc0aac93e08e50e76c9503ca8c

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