Malicious PDF — malware analysis report

Static analysis result for SHA-256 546f9fd703a40e0b…

MALICIOUS

PDF

68.1 KB Created: 2021-03-20 19:00:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b0e694945ce79274695404c350d4bf12 SHA-1: 767034a674556abb4cda56acce009c4d2804d253 SHA-256: 546f9fd703a40e0b38efd9a81f74a40900467a37f051be92328440e484e6b2b1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/aws?utm_term=troy+bilt+mower+bagger PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372955/normal_5ffd3a77ba5d0.pdfIn PDF document text
    • https://cdn.sqhk.co/dogojaseziwo/hjaNugj/63150395203.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412996/normal_5fff0a01460ec.pdfIn PDF document text
    • https://cdn.sqhk.co/sobetevod/ejdiejd/mobile_legends_adventure.pdfIn PDF document text
    • https://cdn.sqhk.co/migixurej/tasvCgi/4162695114.pdfIn PDF document text
    • https://cdn.sqhk.co/fekoguwiwu/LK7ibgd/i_don_t_understand_rap_song.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/jigjazm/simple_royal_icing_cake_designs.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/hj71gih/77908415736.pdfIn PDF document text
    • https://cdn.sqhk.co/gixekoji/ER1ia7I/flights_to_florida_from_detroit_spirit.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/Djcw0ib/chocolate_sponge_cake_tray_bake_recipe.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/d1f24e1e-fa7c-45ac-a676-19775d7144f2/97562619396.pdfIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_daff05fbec31481693d34658cd929694.pdf?index=trueIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_ebd123de377c4a1fb5355eee5c13fc5b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb38fa82-7df1-40db-9d97-b9ada5e47364/cuales_son_los_libros_apocrifos_o_deuterocanonicos.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_e1e10af8a67d4f50866e8c849d06a4b2.pdf?index=trueIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_bb0a8c57af9541b2b72ef0b021eda4ae.pdf?index=trueIn PDF document text
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_617cebd8cde64101967882bc6579d211.pdf?index=trueIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_f7cf889c3f934552ae5dd51b1ac2e7ee.pdf?index=trueIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_46ba70ca5df948ceaac0d27aed689e11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc04b57-1a30-4c83-8242-fa407723e7af/is_revolution_legal_in_the_us.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_290259babfe44b37971142b49f2dca6f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1d319cb-f0db-4b02-afbe-4149f2236657/how_often_should_you_change_a_record_player_needle.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_off0000ccf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF4 5112 bytes
SHA-256: 7f3d157eed8a195938be4507fa1fb97373ba9b7714981023cb75e72626398eba
font_01_sfnt_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 10936 bytes
SHA-256: cff4803bb58d40a3190d9d52ea64780be87523a4646875c51f3dd785ddc539fd