Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ea0f5f2c6d997d…

MALICIOUS

PDF

65.7 KB Created: 2021-03-14 03:51:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 16c7c2ad26449fe1dbed57f6b563493c SHA-1: 588d1eb7a46cbe46b2c86b17946d4a9a46a4f943 SHA-256: a2ea0f5f2c6d997d18abf8ba4e9c5c308f91bb9353c407bff0c1c88026c41bab
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to external malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=river+flows+in+you+acoustic+guitar+chords In PDF document text
    • http://medazuxa.mywebcommunity.org/oracle_12c_sql_chapter_1_answers.pdfIn PDF document text
    • http://help-verification.com/xawave7zaj9.pdfIn PDF document text
    • http://helper-badges.com/online_radio_softwareo1jd1.pdfIn PDF document text
    • http://olymptrade.buzz/kuzafikabp4qux.pdfIn PDF document text
    • http://trells.space/online_advertising_definitiontik4p.pdfIn PDF document text
    • http://fexewivu.iblogger.org/group_discussion_topics_for_mba_with_answers.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/sony_bdv-e2100_user_manualabqax.pdfIn PDF document text
    • http://bahis-sikayet.com/baby_shark_cake_popsip47h.pdfIn PDF document text
    • http://disozire.mygamesonline.org/how_to_draw_a_babys_face_easy.pdfIn PDF document text
    • http://madokedaxemosu.22web.org/89615948952.pdfIn PDF document text
    • http://blacklaser.ru/lord_of_the_flies_island_symbolism_quotesayhs7.pdfIn PDF document text
    • http://siondez.ru/plato_five_dialogues_audiobookyfhwb.pdfIn PDF document text
    • http://lumilizigi.iblogger.org/90870741099.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nononowixumutu.rf.gd/amplifier_remix_mp4_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d7d4ff-a83b-402e-b22f-4c32b9984019/2004_fleetwood_pop_up_camper.pdfIn PDF document text
    • http://fepujevuzal.rf.gd/is_jersey_mikes_subs_good.pdfIn PDF document text
    • http://ruzojonawa.epizy.com/apache_camel_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e92109a4-d128-4ce1-8d1d-38306aef0fc9/goruvulukeb.pdfIn PDF document text
    • http://tivogowajap.epizy.com/xagaviti.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_off0000c3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BB 5544 bytes
SHA-256: c9352e28cbe7d5766e5593514ea1514957f5a7aebba0e6b770a207e606ef5284
font_01_sfnt_off0000d6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B6 10064 bytes
SHA-256: 7192d975d0aeff9c38d7bde7235c3b6c0286e83a10110a3ad008c37804469aa3

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