Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfa6c45ffa760fd…

MALICIOUS

PDF

76.8 KB Created: 2021-05-21 08:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fdd1b22d24f293b8ad506563b285354c SHA-1: aa9b8629e575862e725835ffd67144e9e58873f6 SHA-256: bdfa6c45ffa760fdb89c76a0c0fa5bc7f2f95527c5b60e812e033db1ab4ce0ee
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating it functions as a link farm designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded URLs likely serving as lures for phishing or malware downloads. No scripts were extracted, but the PDF structure itself is indicative of a malicious distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+%25D0%25BC%25D0%25B0%25D0%25B9%25D0%25BD%25D0%25BA%25D1%2580%25D0%25B0%25D1%2584%25D1%2582+%25D0%25BD%25D0%25B0+%25D0%25BF%25D0%25BA+%25D0%25B1%25D0%25B5%25D1%2581%25D0%25BF%25D0%25BB%25D0%25B0%25D1%2582%25D0%25BD%25D0%25BE+1.14 PDF link annotation
    • https://duvozeja.weebly.com/uploads/1/3/0/7/130739152/fajuvujaluwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409417/normal_5fe235e38f168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_600c944a311b6.pdfIn PDF document text
    • https://dotowukigirer.weebly.com/uploads/1/3/1/1/131163902/difivapimez-tixefugosesovit-babixujuro-nulazivip.pdfIn PDF document text
    • https://lusovajilabijix.weebly.com/uploads/1/3/5/3/135351537/bukenu_sixegubifapivaj_mavofegol_xexudaniwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459319/normal_60360f44d245e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469828/normal_604d978c1890d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468553/normal_605018b68cf21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392871/normal_5ff3b284de392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_600be4dfe56f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483365/normal_602bf7a77e682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465705/normal_604b2997b549c.pdfIn PDF document text
    • https://givexikiduxa.weebly.com/uploads/1/3/1/3/131398224/beef9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_5fda91ae7cc57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zikeko/zijekukerujab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ea38c33-6210-428a-95d1-0b36d502490a/2602949919.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/what_is_simbas_son_name_in_lion_king.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45c00de5-4867-4a36-808f-a7ae7ceef282/fefurera.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/exercises_in_style.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_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 6144 bytes
SHA-256: 2b11eb7b831ff63beaf044dc01a1ea9c79b8ca1ed9fde5f83edf37af6c69fb67
font_01_sfnt_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 15904 bytes
SHA-256: 6c617df07a09d8f8b5c2c49d5c7e01c93332f725fbf014ca9ce56b73d646b20c