Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb521172ea83f33…

MALICIOUS

PDF

80.3 KB Created: 2021-01-09 17:40:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6d92265c9a4fc85ca82cfb2951297bf9 SHA-1: 974941da1526305a95f2b508a397f0171981f17c SHA-256: bdb521172ea83f3314d2a2a046e57c62fa25f5e00d9c15552105433e386a7420
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of embedded URLs and the 'SE_DOWNLOAD_BUTTON' heuristic further support a lure-based attack pattern.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/aws?utm_term=acdsee+photo+studio+professional+2019+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489843/normal_5fd92a8b3f961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5f8b3d4981a3e.pdfIn PDF document text
    • https://dijatetobof.weebly.com/uploads/1/3/4/3/134322453/fafavovudoruj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374519/normal_5fce0eb2c10b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383340/normal_5f923463297bd.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
    • https://uploads.strikinglycdn.com/files/7ddefad2-6b3a-4344-b639-8073eb9b9203/paul_ossmann_wife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b0710cb-b825-49d2-bdc0-d0455fa5127f/doubleu_casino_free_coins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a17b38a-8cad-4f7e-983f-5d621ddc1639/65433756865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1109d0b2-920b-40a7-af20-7740bd506512/physics_for_scientist_and_engineers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e1a99ac-e654-4998-b532-a2cb04ab8634/gugigupep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee51b2f2-054a-4bd0-87c8-24f3df52145a/bitafozuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7b2396f-2a6d-4dce-a7db-8c3ed20842f4/download_psiphon_4_for_windows_xp.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/catalogo_jequiti_2019_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30fc72b7-0f98-421b-b5bb-b931d0281343/68514672748.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_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 5596 bytes
SHA-256: 7985172fa2268e67d0395ed2ae4f88766e314f667ebce526fdd1767cdcf0e033
font_01_sfnt_off00010078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10078 10932 bytes
SHA-256: 7c38c9f0e9a4d0ce34b252dcbda86c763305a0cb261420a33337136c7e5c8af0
font_02_sfnt_off000125ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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