Malicious PDF — malware analysis report

Static analysis result for SHA-256 a750b93994c9bc7e…

MALICIOUS

PDF

81.8 KB Created: 2021-06-07 16:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e7b2dd9d000d4bf60649e9fa25936ca0 SHA-1: 34038fd9419c72a49ffe7fc95e2f23f4a0e2ecf6 SHA-256: a750b93994c9bc7ee82bdf7924e51bb313ee0f270a684ffb609241c5d5eaf334
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially malicious content, likely for phishing or spam distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nomylo.ru/pbw?utm_term=what+does+the+number+next+to+youtube+tab+mean PDF link annotation
    • https://litexude.weebly.com/uploads/1/3/4/5/134592330/vuwunotirojeze.pdfIn PDF document text
    • https://vatewiwep.weebly.com/uploads/1/3/4/4/134482367/zetik-dowofum.pdfIn PDF document text
    • https://pudemozesuvetit.weebly.com/uploads/1/3/7/5/137515762/wiwowome_zunekazub.pdfIn PDF document text
    • https://zipuboxovasabe.weebly.com/uploads/1/3/1/4/131483293/lubun_mogejojapov_nobogofezo_pokolodipuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449965/normal_5fcc3ea346467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530323/normal_603c3c9e319ef.pdfIn PDF document text
    • https://bokesaxigalul.weebly.com/uploads/1/3/0/7/130776824/bikujijizoned.pdfIn PDF document text
    • https://rukeruxesam.weebly.com/uploads/1/3/4/7/134700508/zewugokolomipu.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/davuzubisawomez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530910/normal_602c8ea87ba5e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4389793/normal_60b08f16142c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388406/normal_5fcc013f80b13.pdfIn PDF document text
    • https://diwopoko.weebly.com/uploads/1/3/4/5/134597367/ae1f242a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380881/normal_60505b8813066.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://midevodimu.pbworks.com/f/28758872311.pdfIn PDF document text
    • http://panuduxeruv.pbworks.com/f/kurumi_tokisaki_live_wallpaper_android.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144581433/dividing_fractions_worksheet_grade_4.pdfIn PDF document text
    • http://fisojun.pbworks.com/f/49846015245.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/admiral_dryer_aed4675yq1_manual.pdfIn PDF document text
    • http://namikikis.pbworks.com/f/53434855985.pdfIn PDF document text
    • http://tijigika.pbworks.com/f/libro_de_matematicas_de_2_grado_telesecundaria_contestado.pdfIn PDF document text
    • http://muxapoxowo.pbworks.com/f/fodomanuzabejipivevoz.pdfIn PDF document text
    • http://metudebebi.pbworks.com/w/file/fetch/144619860/38729821278.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_off00010132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 5356 bytes
SHA-256: 2472cf4726f917f8777a9801170f4b841868b4448e5d3c98e964f1f8af64f2ba
font_01_sfnt_off0001134c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134C 11168 bytes
SHA-256: 951f37cb4c789539e0d5397cd76ab29768ba289d2136113c8bac7519db935f37