Malicious PDF — malware analysis report

Static analysis result for SHA-256 361f9cdf611e2b62…

MALICIOUS

PDF

85.9 KB Created: 2021-03-31 05:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 063ecab29b713bac8b7b396f9f62e773 SHA-1: 52a0627f44b0fee7e09ad7ec370d04c7c0f59896 SHA-256: 361f9cdf611e2b625f77edf9b66b5d5f481f334191e6dac4f2bc53ef9c8f2324
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically flagged as an external URI pointing to 'bologen.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or spam campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the presence of numerous external links points towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://bologen.ru/award?keyword=bernoulli+equation+example+problems+differential+equations+pdf PDF link annotation
    • http://megiloreb.mypressonline.com/acido_basico.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454424/normal_5fed424709bb6.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/laruxonejutuzobawe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485172/normal_5fcbe22416043.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/LYVLgiw/heroics_and_ros_review.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/jbgghfa/90446986578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410731/normal_5fea1c1750d9b.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/Py0ajdF/95117435412.pdfIn PDF document text
    • http://pewekelexu.mygamesonline.org/88779456344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465012/normal_5fd33beec58f1.pdfIn PDF document text
    • http://tebogekememesij.mygamesonline.org/dolidebux.pdfIn PDF document text
    • http://bugilinupapud.mygamesonline.org/titazaxigex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378167/normal_6019297c98183.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/2a46f7b8-bd6b-40d1-8623-89e06d6c2d27/nupitukixavugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed33ed3-8a1b-4329-8a44-6358d119681b/31131722060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0750fce3-526b-479f-b17b-3f0469f58b83/puval.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f732dde1-86ce-453b-9258-767e554e071c/84198824246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/901512ba-96df-4130-84a6-0d8de989d46c/whos_afraid_of_virginia_woolf_summary_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d51967d-da34-43c6-867c-0afc793f3abe/40738133316.pdfIn PDF document text
    • http://sanojepenot.onlinewebshop.net/play_boogie_woogie_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2344c90f-b5c6-4c93-b06a-056792f32446/how_to_export_blender_animation_to_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/407ae4da-b747-41c9-8c21-5c9e7a40585a/10900966380.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 5568 bytes
SHA-256: 38a88f3915b604171da675afb1d7442f5c0542581514b0ad5bc9aaff96fdfbe3
font_01_sfnt_off0001093c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 12324 bytes
SHA-256: c7b656b1782d2e1127cddafa162dab8cb15bec98dfe856556f10854eb0c00d7b
font_02_sfnt_off000133a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A7 16188 bytes
SHA-256: d4a9ad1af6505c34ecaa8bf2e36ae125077a83af1a012d433184c0ee5b3d2587