Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d14e1b861e1309…

MALICIOUS

PDF

93.8 KB Created: 2021-04-26 16:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 2189438db82d2c62024f223149c1267b SHA-1: 3b2bb7192e8c7a364814b1a7ff52e69950522546 SHA-256: f8d14e1b861e1309c9501d3b64662cf8e3235d43f9e5f79f2f653ac3413bd672
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=vampire+diaries+season+8+episode+16+songs PDF link annotation
    • http://majejuf.22web.org/a_twist_of_the_wrist_free.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/88710011021.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/jchcMkx/high_speed_chase_pinball_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/idgjjdz/top_hashtags_today_linkedin.pdfIn PDF document text
    • http://kefevonubud.22web.org/bollywood_old_movies_best_sites.pdfIn PDF document text
    • https://cdn.sqhk.co/pijajawopoji/gWinhi1/agent_orange_victims_vietnam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/sevoga/maths_quiz_questions_with_answers_for_grade_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8db9f7cd-9389-4ce6-b23e-4d5f9e16dfe5/junuxivipumogamal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1fcdd81-201e-45fe-b1e5-f6e548098d40/functional_independence_measurement_fim_user_manual.pdfIn PDF document text
    • http://sesilav.rf.gd/30301912216.pdfIn PDF document text
    • http://sedegagagojuwej.epizy.com/holistic_care_model.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2befda9e-f2bd-4098-b009-bdd5d405c3b9/what_order_do_you_read_the_secret_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b949a4d8-3feb-464a-ab5e-204cea601d32/80900693136.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/kanukat.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/infeccion_por_blastocystis_hominis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12be5199-c134-4da0-9708-48e17d92d35c/tizujomiwidaril.pdfIn PDF document text
    • http://zozupajekuledus.myartsonline.com/civic_engagement.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11544 5612 bytes
SHA-256: d99a07c72c2fabc254d535a21d751e1d1a5140e44456e6dce4fef2cb6bb82339
font_01_sfnt_off0001283d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283D 8628 bytes
SHA-256: 9ffb1d13fada1be674f525202c8f669f5b6c239bf5eeb7ec50eb9c61ebf3745a
font_02_sfnt_off00014025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14025 12856 bytes
SHA-256: f0e574648c0b55a01dd0bfd47dcaf9c6d387374d56b276d29a19a0542befbfcf

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