Malicious PDF — malware analysis report

Static analysis result for SHA-256 89afba6f161ddf9a…

MALICIOUS

PDF

85.5 KB Created: 2021-03-11 03:47:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: a16c63031fd089fbab6bf3d38e348bb7 SHA-1: 7ca3b4416fcf5e3105e1d1b691a0af5d8104276e SHA-256: 89afba6f161ddf9a63ff28418ec418cee423e0a0061f68cad8b56d73f49cb8ef
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm designed to manipulate search engine results or redirect users to malicious sites. One URL, https://yafferge.ru/strik, is specifically flagged as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=easy+sewing+patterns+for+beginners+uk In PDF document text
    • http://teasmall.space/vodigusoviwugosixggd4.pdfIn PDF document text
    • https://majivuwuwu.weebly.com/uploads/1/3/2/6/132683475/jegedalaman-kosax-xubowun-fudanunumilok.pdfIn PDF document text
    • https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/woxelito_konit_wupajekigosa_gekovapoju.pdfIn PDF document text
    • https://nupezodebugu.weebly.com/uploads/1/3/2/3/132302780/kozijoniv-nikup.pdfIn PDF document text
    • https://guwuviwanawa.weebly.com/uploads/1/3/2/6/132695801/7d0e61e230963.pdfIn PDF document text
    • https://noxawopaxuroge.weebly.com/uploads/1/3/1/3/131398379/1040748.pdfIn PDF document text
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/gowaliromepo_mutibenizaziju.pdfIn PDF document text
    • https://zumonula.weebly.com/uploads/1/3/5/3/135323502/6550511.pdfIn PDF document text
    • http://idealica-co.site/4027529628b7h9z.pdfIn PDF document text
    • https://duvafoxugijotad.weebly.com/uploads/1/3/5/3/135305538/4395843.pdfIn PDF document text
    • https://ritipovilij.weebly.com/uploads/1/3/4/6/134650849/tekava-warulur-wujudis.pdfIn PDF document text
    • http://artrosil.xyz/Vysok_kola_tudent_cv_ablna_ukyq1ag.pdfIn PDF document text
    • http://iuts.space/spirited_away_subtitled8h5t.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/bda3b462-d3e0-4603-bb1a-125079b9980b/shark_rotator_lift_away_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0e9fbbf-aede-4c1b-a8ea-36fd5850624e/povekuziwaxibidozin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cc8c081-12b4-4b70-9f18-3d557c83b12f/22942038227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0833e436-454d-49ac-870b-0312916c2a01/irobot_roomba_670_robot_vacuum_r670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f646c87-18ae-4666-9a4b-2a251220f41b/is_megaboom_3_or_megablast_better.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c274b89b-2244-406e-bfc3-a6a2d6067ec1/can_gyms_charge_you_during_covid.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_c817d0dcc81f4e9e8eea1f68aedfa733.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_e27f54402c424679a8318a2954b94619.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_2c2dc389d54649c4857e17ed82d2b138.pdf?index=trueIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_96c19b4998e54e438a82c0e0e06a982e.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_5cc1469280804f96bddd5262a567f717.pdf?index=trueIn 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_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 5392 bytes
SHA-256: 1c08a68c4406636d3a9c41bfc05e6a66c15705a10b6048ad69755e7a6534764c
font_01_sfnt_off00012413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12413 11140 bytes
SHA-256: a8e0d70dfd8767004f652106c0b8b31e5105267aa63a467e411bb5b480bb38d3

Open this report in the interactive analyzer, or submit your own file for analysis.