Malicious PDF — malware analysis report

Static analysis result for SHA-256 51067816d5f8a506…

MALICIOUS

PDF

71.5 KB Created: 2021-03-27 18:02:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bd21a3bfb40119fc48b7cc442e858a96 SHA-1: dfcca943d36c56fd5d83dcb5dd7c481336a5359d SHA-256: 51067816d5f8a506674258c1bf3b4a9baf345ed3c650a61a893ff0860306bced
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to disposable hosting services, indicative of a link farm designed to obscure the ultimate destination. The presence of a 'download button' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest malicious intent. The ML classifier output of 0.999784 further supports this assessment, indicating the file is likely a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://dugedepap.ru/123?utm_term=canada+femicide+report PDF link annotation
    • https://cdn.sqhk.co/zebenane/higdieq/tizodonesunidogakelireses.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/ahgmjf8/tadukuseroledosusibof.pdfIn PDF document text
    • https://cdn.sqhk.co/kiraxozi/f9if763/torovamovidijixiked.pdfIn PDF document text
    • https://cdn.sqhk.co/sojuzafu/hMihOy8/14278777811.pdfIn PDF document text
    • https://cdn.sqhk.co/kamepixuxuk/eEibiYk/34658877701.pdfIn PDF document text
    • https://cdn.sqhk.co/tavanaru/jhZSypU/muduvuvutufedojirolumim.pdfIn PDF document text
    • https://ridixuzo.weebly.com/uploads/1/3/4/6/134605053/girorol.pdfIn PDF document text
    • https://cdn.sqhk.co/gatuwaven/gcgfIhg/61995295723.pdfIn PDF document text
    • https://gemitipob.weebly.com/uploads/1/3/4/4/134474898/9c38ce.pdfIn PDF document text
    • https://cdn.sqhk.co/peretudiwi/dhcuhgq/ijazat_full_video_song_3gp.pdfIn PDF document text
    • https://cdn.sqhk.co/kexofodatop/hfOhiT7/80873932120.pdfIn PDF document text
    • https://cdn.sqhk.co/vapitinab/jDjjTFP/tangled_soundtrack_playlist.pdfIn PDF document text
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/nizojopesiwa.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/jn7QHdf/hexion_inc_locations.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7901dd0c-49a9-4a56-8d35-48315b1f6525/44079143842.pdfIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_f5af0f65f70f43db9967963cf4acacb4.pdf?index=trueIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_02c552c668134b408f420fd40905787a.pdf?index=trueIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_72950ca848cd4da9886d521f7d57c7db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b265c689-7f94-4989-baf0-68250ec50773/saxon_math_2.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_off0000dc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC10 4996 bytes
SHA-256: 094f27a112c98159bf87ce07514634515f9c1a33e41c0e3678bd1e67bca65e12
font_01_sfnt_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 10996 bytes
SHA-256: 7837ad290711b04cd2237cc846e5cffdb16d491314c0f8c2506a1ca406f8b755