Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1e67f4841361f8…

MALICIOUS

PDF

78.5 KB Created: 2021-03-28 21:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d4b8e1217cb22c062fcdff80b40752ba SHA-1: 8e64b3a446c11d32b0752915e796a3739cf0585f SHA-256: 5e1e67f4841361f86ffa2a316dae3f23ee8b44c9d1280ff0f1cf46eb1e1db6b7
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses an invoice-themed lure. 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 0.9997

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://fokemale.ru/strik?utm_term=what+is+dsc+in+pan+application PDF link annotation
    • http://gogogoinst.xyz/4594819018053oo1.pdfIn PDF document text
    • http://idealica-co.site/avant_browser_for_mac_free6g85u.pdfIn PDF document text
    • http://vobafoselalulor.mypressonline.com/xipoxorux.pdfIn PDF document text
    • http://devicesprotectionforusers.site/536128280204384v.pdfIn PDF document text
    • http://rmk4sale.xyz/siwunusavilalipuboqxy2.pdfIn PDF document text
    • http://prizinsta24.online/shark_ion_robot_review_pet_hairkxtbi.pdfIn PDF document text
    • http://lg-supportteam.com/93346886809w12rr.pdfIn PDF document text
    • http://vykupavto54.ru/emulateur_android_mac_10._6._8d6ydu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://titugol.atwebpages.com/36995188069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d810b31-5d09-4115-8256-7f672cec72c9/list_some_project_management_tools_and_techniques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77b222f8-3ea5-48a4-9e21-9c16a1d67b1a/how_to_write_a_faith_statement_for_confirmation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda7b8ba-075e-465a-ab9a-65cb01cb70b3/dudaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe7f5917-b429-4569-baa1-a05b842036f0/cant_open_sound_in_system_preferences_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3e11dfb-ab4e-4957-9533-0e0c58aa5ae5/how_to_write_a_paragraph_about_my_pet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/431cd690-0825-40f2-aced-c9cdefdc1ff0/dufukaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/778123c1-eb6c-43c8-aa75-a503c9f4b185/dupesamusoxepame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f193fba2-e45f-40e5-9aab-ba7188910c9c/instructions_for_applying_car_window_decals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/869ca7ae-6f1f-475a-9312-3b8cf7ccd711/50343332448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76858048-f7c1-49ea-8f0b-566975980912/96462073930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/805b3a14-021a-4e53-83ec-1cc3ab8f940f/fighter_diet_cookbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0507f50c-4a37-439f-a6d7-edd17f049cea/dovibutagil.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_off0000f327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 5076 bytes
SHA-256: dd71115ef85c3eb2ae1670501bd6f4406d2203965c13b92260c0589859230728
font_01_sfnt_off0001047a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047A 11400 bytes
SHA-256: 93626ca51afc3d1b9e73e42999a4b388bb17ba52c485b756a99a496d09451168

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