Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe2a2e4fb80ec9c…

MALICIOUS

PDF

76.9 KB Created: 2021-05-18 01:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7be49b3dc8cca9e33ff6068246265c04 SHA-1: 6e89c6236ea236251863843b915c0d1058998deb SHA-256: efe2a2e4fb80ec9c957e97eff5232cf9dd27d53a92f78b4015c2177b83c9bed6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9995

Heuristics 5

  • 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://midufefew.ru/strik?utm_term=what+books+do+you+read+in+ap+lang PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367952/normal_6063d1a4f28d1.pdfIn PDF document text
    • https://teraludejos.weebly.com/uploads/1/3/5/3/135304334/pexuxukajoti.pdfIn PDF document text
    • https://jelonuzekuxenu.weebly.com/uploads/1/3/2/8/132814084/degezefe_pevibabiwepalad_vusefamilat_zijebalubibalu.pdfIn PDF document text
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/mekizigejukorawizobo.pdfIn PDF document text
    • https://tozabofosizo.weebly.com/uploads/1/3/5/3/135340530/maxefasa_dixonaj_mevel_pujudi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464739/normal_60596a7eb0e1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411918/normal_6049afaaa8e2d.pdfIn PDF document text
    • https://kivobuduzuv.weebly.com/uploads/1/3/0/7/130739084/4067218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_6022a02ec94a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kufazete/xbox_360_error_code_807b01f7.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/background_png_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30fd27aa-9da7-4552-a7d0-77d940ba2642/puvuxixemipozosivupu.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/trig_functions_of_any_angle_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/050f19c0-be67-4782-8c70-289e46f3dd10/68593435954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bfabec8-c850-4a8b-ac84-d741c4c6617d/befafuzivoxisopaninuketo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0adc0666-85f6-4bf3-90c0-3f70a3d49765/pusesaxiguweluxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e36adb34-a258-404e-aa84-00144f007b4d/insurgent_original_book_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30331012-3199-440e-b0c6-65d0de606311/geravijamasorofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ceccbc-b066-46d1-a092-92c8839f6e80/can_you_take_the_gre_on_a_macbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b9e44a0-3f88-4a0f-8bbf-fa4c3a11c6cc/lefewagarutubigokipuko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f9c8685-1ffe-4f61-822b-88b4c57d9620/the_origin_of_national_consciousness.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/bebomurewisugerudifuzixa.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_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 5540 bytes
SHA-256: 60108e70ed08a355eb3578c79fd61e407925090d135b14701c20334f0874ce3a
font_01_sfnt_off00010022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 10596 bytes
SHA-256: 2e000a7a958ce3ca2c3246d6c27aeb6e9705b68bc612779a15e917f03c0177df