Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad515e56ce5b6c9…

MALICIOUS

PDF

80.0 KB Created: 2021-03-24 21:52:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 99a7540f5dbbbc145092bf99916c2b95 SHA-1: d58a819d335782af80f8c39c8893458bec9a6bb3 SHA-256: 5ad515e56ce5b6c92fb3fd71a1153bd4ab40ae63b5d7704bc19fab5cb92ed29d
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly indicate that the document's primary purpose is to redirect users to potentially malicious external sites.

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://resalured.ru/123?utm_term=calculer+taux+d%2527+%25C3%25A9volution+formule PDF link annotation
    • https://buvaranugabenu.weebly.com/uploads/1/3/0/8/130873820/485021dc099.pdfIn PDF document text
    • https://wupixizot.weebly.com/uploads/1/3/5/3/135398135/pofefitugenotatid.pdfIn PDF document text
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/5043773.pdfIn PDF document text
    • https://woxatawupipop.weebly.com/uploads/1/3/4/0/134016674/e62a1c71.pdfIn PDF document text
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/842414c066cb62.pdfIn PDF document text
    • https://gifawinap.weebly.com/uploads/1/3/4/3/134386913/abc375d8.pdfIn PDF document text
    • https://rerimewanuxo.weebly.com/uploads/1/3/6/0/136036548/kotepusakivak_pomorozuvije_zatadefojudodi.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/cb10cc9d-a652-4bd1-8668-ebe8c7fb27c4/tecumseh_hmsk80_specifications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ca91f33-f3de-497f-9fb8-c9bd91103a78/murray_select_riding_lawn_mower_belt_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0fc70dd-9d39-4d21-832d-cd80c4eb698b/bofezewevibigetuleguniti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46778180-6bc1-405c-8881-bf805a60086a/36672958788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b04988d3-162a-40c0-858d-2bee6e99a3c8/80308155745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c410b6b-2e59-464c-9509-fec1db772421/gamalivalugezegabomun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d657663f-14db-47e5-9556-7e3fa143ce5e/lowrance_elite_5x_hdi_installation_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80abae72-4322-4653-b7e6-0a2c73b15586/camera_sony_nxcam_avchd_mpeg2_sd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9103fa35-2c76-4ac3-be45-8859bc70b19e/29481365566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a179827-b7f9-4a7d-a743-1df4f4b18f94/67368983741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff00a31f-3e71-426b-85c9-dd5206929c2c/96499765653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21ffa45d-521e-4775-a97d-1c74fea7cba5/howls_moving_castle_book_three.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_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 5200 bytes
SHA-256: f117ff7f923299195841dcead0ca9d2d0163530ea677da507ef95fa247e64125
font_01_sfnt_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 12892 bytes
SHA-256: b42cafaeca9538716c73df39860d0f40699befaee79541fd6f4e02f558b1a8a4
font_02_sfnt_off00012233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12233 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361