Malicious PDF — malware analysis report

Static analysis result for SHA-256 5884d4f8fa8f59f7…

MALICIOUS

PDF

82.3 KB Created: 2021-03-10 00:29:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 7c130c25de82c55226112c3f7d3badce SHA-1: 183c8d824ae32f55a2b86444a179aa6baace14ad SHA-256: 5884d4f8fa8f59f7d3a7b398fb16262ccdbc7d89bd7e382bb1332e5cb2540fdf
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that point to other PDF documents, suggesting a tactic for SEO manipulation or distributing further malicious content. The presence of multiple disposable hosting domains and UTM parameters in the URLs further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/strik?utm_term=safety+1st+baby+monitor+sound PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384296/normal_6027d71b3fad0.pdfIn PDF document text
    • https://vowagogo.weebly.com/uploads/1/3/5/3/135307183/jofobagetinabofup.pdfIn PDF document text
    • https://petugaxuw.weebly.com/uploads/1/3/5/3/135397026/tunakijajizuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471484/normal_5fd128929d2ea.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/iaThbgg/guess_the_picture_zoomed_in_halloween.pdfIn PDF document text
    • https://romubavopu.weebly.com/uploads/1/3/4/8/134884942/b8917cb656.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383322/normal_5fdec6026a314.pdfIn PDF document text
    • http://216tilford.com/38528169103686h8.pdfIn PDF document text
    • https://teselabobebivu.weebly.com/uploads/1/3/1/6/131606188/lepuwewufexovixidip.pdfIn PDF document text
    • https://debamivuk.weebly.com/uploads/1/3/1/8/131871977/579775.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/wSNFDjf/57652828760.pdfIn PDF document text
    • http://6gusevshop.website/how_to_play_dominoes_with_2_players_youtubee378z.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/eA6DcQh/35368798812.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/eCzjifw/last_pirate_island_survival_mod_apk_new_version.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413110/normal_5ffd29071f6f2.pdfIn PDF document text
    • http://mini-camera-super.club/subobejufozaum0wx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_8c06cfe65b064510a7f2bca06cdbb76f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af89fee2-1d42-4151-812a-c7279fa6aeab/how_many_the_princess_diaries_books_are_there.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb16c89-4f5a-4961-9b5a-5c9d1117164b/xujifeminelune.pdfIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_64189c2905fe472d93e147b779091a17.pdf?index=trueIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_17197a715bef46659256a7b4c4f2396f.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_e39b4ee316d6408eb253779eadeaf6fc.pdf?index=trueIn PDF document text
    • https://ddd90330-5837-4e0c-b2f6-9383941cd2db.filesusr.com/ugd/568e2c_f449a2da036f4b2aadca3d5ee0fdf697.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_off0001047f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047F 5416 bytes
SHA-256: 7f35e6143f054bc37cad634205cb2c3ff75b2dcc2fdc09a928dd46f028434427
font_01_sfnt_off000116e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E3 10696 bytes
SHA-256: e3cc8748d6beee31b934052a5f66b1cfa8cf6aa5400511d5cf6dca472b400fa9