Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e25fab489b74225…

MALICIOUS

PDF

81.1 KB Created: 2021-03-10 08:33:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9b149ce481e103d804eb132e3fe47742 SHA-1: dcfcad41bf43956c1f6356e64f52a9dd58606f83 SHA-256: 1e25fab489b742250d5a85da27d224c8b351c04f754502405db349c015a593b9
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many hosted on disposable domains or services like Weebly and sqhk.co, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the heuristic firings strongly indicate the document's purpose is to drive traffic to these external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jottigo.ru/strik?utm_term=nitecore+new+i4+reset PDF link annotation
    • https://kufidadifijerid.weebly.com/uploads/1/3/1/4/131407945/1130a4bbf307fa.pdfIn PDF document text
    • https://gufekesunix.weebly.com/uploads/1/3/4/8/134888283/0a793142aedae.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/ifbtIgf/77447931357.pdfIn PDF document text
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/5291663.pdfIn PDF document text
    • https://cdn.sqhk.co/puxezuxivas/0pbgcgi/pubg_wallpaper_1920x1080_hd_laptop.pdfIn PDF document text
    • http://xojopimo.22web.org/toastmasters_table_topics_contest.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/rhdibNC/niwasuvinatogeji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415740/normal_60236696d2836.pdfIn PDF document text
    • https://kefejuze.weebly.com/uploads/1/3/1/6/131606268/08e662950e.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/hbujdjg/eassist_dental_solutions_salary.pdfIn PDF document text
    • https://dixodenifafazud.weebly.com/uploads/1/3/1/8/131856669/mejolivo-nuvofalitaxik-weravuzezupovi-wesumutuguwanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392668/normal_60475fb285187.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393358/normal_5fc5a93ac2c03.pdfIn PDF document text
    • https://wawokosekipazas.weebly.com/uploads/1/3/1/4/131452886/5245835.pdfIn PDF document text
    • https://romudakon.weebly.com/uploads/1/3/5/3/135318284/fojukugidinujafodi.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/hsFgj27/men_s_soccer_world_cup_2018_standings.pdfIn PDF document text
    • https://nebenumepidenok.weebly.com/uploads/1/3/5/3/135307723/5412384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469640/normal_603b375aaeaf0.pdfIn PDF document text
    • https://wavoxodasamemat.weebly.com/uploads/1/3/5/3/135348105/puxusij.pdfIn PDF document text
    • https://mexakogu.weebly.com/uploads/1/3/5/9/135981712/3642144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_600bed1e39cb4.pdfIn PDF document text
    • https://xitolomeka.weebly.com/uploads/1/3/4/0/134012462/487e4b.pdfIn PDF document text
    • https://bateworolod.weebly.com/uploads/1/3/4/3/134315912/bf1e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://muweluboxakok.rf.gd/vepepobusavibisogemurejij.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 4488 bytes
SHA-256: 76f41470b23813e5a42ffecc948a10372dd72be6f17e09093d25214ee0823b65
font_01_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 11156 bytes
SHA-256: 0d93585449466c4acf91607dbd87bdfb8b22d71259acff7602bb47bd22caa386
font_02_sfnt_off000128f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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