Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21aa775d4ad4a58…

MALICIOUS

PDF

78.2 KB Created: 2021-03-15 08:18:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fcc0c067b1906f792a4a7d6a05d0170a SHA-1: 22fd8c70dfea9cc45b8c144fd94b06232be0f7ff SHA-256: c21aa775d4ad4a581a36196320ba8c3462cd54323eac7d7d7336dd21be6afc88
146 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. It uses a QR-code 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 0.9991

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://leonvi.ru/strik?utm_term=does+the+red+cross+offer+free+cpr+classes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474170/normal_602ffa173d3ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485322/normal_5ff6827f5c136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451549/normal_60212409e7fae.pdfIn PDF document text
    • http://goldenframecollision.com/bissell_proheat_2x_pet_manualh35af.pdfIn PDF document text
    • https://pofubelepegeva.weebly.com/uploads/1/3/0/7/130776421/fasidog-sowovinelewo-beduxizinubalaj-fulotafexolape.pdfIn PDF document text
    • http://werojati.getenjoyment.net/mugidoketujud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408995/normal_5fee432dc72a7.pdfIn PDF document text
    • http://trujillostacoshop.com/mario_kart_8_deluxe_guide_books4sl8.pdfIn PDF document text
    • http://rezltml.xyz/kagosetun19c.pdfIn PDF document text
    • http://zavodtriumf.com/what_did_the_bible_say_about_drinking_wineo5jq5.pdfIn PDF document text
    • https://reravojune.weebly.com/uploads/1/3/1/4/131406269/salukareladoled.pdfIn PDF document text
    • https://janirakuvofubej.weebly.com/uploads/1/3/4/7/134734148/xakosutisuf_libagumukuded.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/books_to_read_if_i_liked_the_couple_next_doorvka5z.pdfIn PDF document text
    • http://ezfix.asia/ruud_tankless_water_heater_error_code_12ofhqc.pdfIn PDF document text
    • http://bachanalytics.com/wejuxuj0zj3.pdfIn PDF document text
    • http://3gusevshop.website/841586983173my1p.pdfIn PDF document text
    • http://mesretly.xyz/zipewogabaruvemokojevuba5uc.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/7b05d67a-91d9-4428-8648-ce02b8370ce5/cibola_burn_book_recap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43e15396-f527-4cc6-b39e-41c8524e7f14/how_to_unstick_xbox_360_controller_buttons.pdfIn PDF document text
    • http://mawokale.myartsonline.com/28726213380.pdfIn PDF document text
    • http://puribisipup.atwebpages.com/learn_matlab_fast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99fe275-e7cb-4061-9714-759a030dce2f/a_long_obedience_in_the_same_direction_discussion_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b615534b-e40d-4340-b6dd-2343e040a722/poxugoviw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9d0faeb-bf32-4b66-be60-3818185e5294/which_actors_are_dead_from_harry_potter.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_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 5240 bytes
SHA-256: d1325657325bae8b21f12730dfb3b2e2d810478426cf3ce612e459d7e247926f
font_01_sfnt_off00010684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10684 10600 bytes
SHA-256: b89304ba88dc97390874f958c291184bd4688d2a825967367c08fae48d1a3695