Malicious PDF — malware analysis report

Static analysis result for SHA-256 d925dbbe7c664823…

MALICIOUS

PDF

90.8 KB Created: 2021-06-13 05:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d1ea55f450cd12ea4f35f19fa3a8a25a SHA-1: 529a58389453239f4cd546f9990ac2991ee36a1d SHA-256: d925dbbe7c66482316ba616add1000cf72524db70c2b7f608bebc2b8c6693ef6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. The presence of numerous external URIs and link farms points towards a strategy of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://inwebjor.ru/pbw?utm_term=la+paix+oui+la+paix+partition PDF link annotation
    • https://runufegoxow.weebly.com/uploads/1/3/5/3/135347372/zapadozozoxutupamu.pdfIn PDF document text
    • https://pozitolize.weebly.com/uploads/1/3/4/3/134330731/xixagogimojinov.pdfIn PDF document text
    • https://xibupofuku.weebly.com/uploads/1/3/5/3/135306475/fudesavenonabaxaxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_605de2e913494.pdfIn PDF document text
    • https://wuduzavuvavazi.weebly.com/uploads/1/3/4/6/134618101/tukam-kulirunixozibaz.pdfIn PDF document text
    • https://bumipavadawafez.weebly.com/uploads/1/3/2/7/132710759/daxamaraxetewo.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/ee07d8e7.pdfIn PDF document text
    • https://gulesome.weebly.com/uploads/1/3/4/4/134496781/jefin.pdfIn PDF document text
    • https://lazidejapagopi.weebly.com/uploads/1/3/4/8/134891766/wodix.pdfIn PDF document text
    • https://jokiwaxe.weebly.com/uploads/1/3/2/7/132740814/7343818.pdfIn PDF document text
    • https://kilixezexixoz.weebly.com/uploads/1/3/1/1/131163494/golujanubolira.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382966/normal_605fb1fdbbe8b.pdfIn PDF document text
    • https://zulujiporanaru.weebly.com/uploads/1/3/4/5/134590758/3417424.pdfIn PDF document text
    • https://fibavizenimi.weebly.com/uploads/1/3/4/4/134485548/bb96f.pdfIn PDF document text
    • https://zelelifejoba.weebly.com/uploads/1/3/4/3/134321633/mefimariba.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://zezimin.pbworks.com/f/examenes_resueltos_potencias_y_raices_1_eso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd51bd4-b8e2-4422-ae1b-bc03f552afc7/butivedupuwonobabutifiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f5f328-4f89-47e7-9628-053dfc5d0d35/kulekazigolorisumijazunom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/543f978a-a77a-4f26-8175-33b822d908d4/the_things_you_are_to_me_piano_sheet_music.pdfIn PDF document text
    • http://selapiwilapa.pbworks.com/w/file/fetch/144955323/40087229588.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_off00011666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11666 4408 bytes
SHA-256: cceb13982ef39eb60e51695b0f2486adae20b696c30907f458e6f7f9c4fe301a
font_01_sfnt_off00012562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12562 13224 bytes
SHA-256: fd97233b1b75f9ef7c5aadd28227ede0809e110462d0ce9a941fd6255c5eb7ba
font_02_sfnt_off00014e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E39 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c