Malicious PDF — malware analysis report

Static analysis result for SHA-256 400625c4a59f23b7…

MALICIOUS

PDF

91.1 KB Created: 2021-06-11 17:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c29592b1f70fae7f621b2a8068303272 SHA-1: a946ab9da27daea061c8ae2b48fbe7fa7987e0b7 SHA-256: 400625c4a59f23b7dd139a18129c724ceb09dfd41d96b409f0e0095565db7ac5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to host malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted from this sample.

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://synerhu.ru/pbw?utm_term=lonely+days+novel+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454541/normal_5fd1d20d88e62.pdfIn PDF document text
    • https://gomamuna.weebly.com/uploads/1/3/5/3/135304292/bukobat.pdfIn PDF document text
    • https://jatupixi.weebly.com/uploads/1/3/1/3/131398141/3956246.pdfIn PDF document text
    • https://guxikotazo.weebly.com/uploads/1/3/4/7/134704652/2131550.pdfIn PDF document text
    • https://getaforufuzok.weebly.com/uploads/1/3/4/7/134733873/8052159.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420906/normal_5fd07f576589c.pdfIn PDF document text
    • https://juzuxuzi.weebly.com/uploads/1/3/5/3/135332424/kotidipakawogus.pdfIn PDF document text
    • https://xikoxuzit.weebly.com/uploads/1/3/4/6/134632277/fedusisidifujojamulo.pdfIn PDF document text
    • https://piwuwati.weebly.com/uploads/1/3/4/4/134404243/210eb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471253/normal_604e7e6d16f7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391898/normal_5feafdd7a9526.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://seromazu.pbworks.com/w/file/fetch/144708879/wofidafobuxalabim.pdfIn PDF document text
    • http://newubotadov.pbworks.com/f/10761294326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f43faed-249a-4649-b3da-1e4b9503d1c6/can_you_keep_a_secret_karen_perry_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6e37223-3458-44de-99dc-bde3cd20bc4d/13366523707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0abbffc4-0d63-4266-b47a-2c7197d0429c/58254481992.pdfIn PDF document text
    • http://liguduper.pbworks.com/w/file/fetch/144472200/41334424736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0af5c46f-d291-456c-b4a3-57bffede2ba4/how_to_connect_toyota_corolla_clarion_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f4d34dd-671f-4969-b863-78c2ff8ad607/14505603436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0af7c994-e134-441d-995a-6e6e7612b7da/assassins_creed_hidden_blade_plans.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/f/fejokuzisobipebitev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2707ba2d-5e92-47d3-9dd5-fb39f75924fe/43903387638.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_off00011b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B10 4792 bytes
SHA-256: 04214f5c7012d429c7d4a8f5f98ffc53a99df024eec3b86c0ff610ffdfe06983
font_01_sfnt_off00012b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8B 10868 bytes
SHA-256: b18ce4b5ae34010daa8a145e4994ae8b2eaff40314ba2a6aef5cde3b5326a8bb
font_02_sfnt_off000150a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A1 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c