Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeab3ae32159ee78…

MALICIOUS

PDF

66.4 KB Created: 2021-02-18 17:52:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8b80f7d99c5b8b91cea4a4237a403f16 SHA-1: 46eb52eb97619d162004c06c6ad3c205b8df5d60 SHA-256: aeab3ae32159ee785decd74bb74ca10ef169ea0dab20c7c65b5a24266a822df7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm hosted on disposable domains. This technique is commonly used to distribute phishing content or redirect users to sites hosting malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://bologen.ru/wix?keyword=parent+function+worksheet PDF link annotation
    • https://cdn.sqhk.co/zebenane/iFaVn6A/rasom.pdfIn PDF document text
    • https://cdn.sqhk.co/wanukawuwota/hjeidbb/mars_time_zone.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/didjeid/square_body_trucks_for_sale.pdfIn PDF document text
    • http://erse.xyz/tere_chumme_me_song_wapkingymww0.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/f5hiejd/wivododasipoxazewexaz.pdfIn PDF document text
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/biluzapuzuzenow.pdfIn PDF document text
    • http://lovemecompletely.com/what_neutralizes_pet_urinexfboj.pdfIn PDF document text
    • http://idclick.cash/mariadb_mysql_manualw5wf0.pdfIn PDF document text
    • https://jinozeposejide.weebly.com/uploads/1/3/1/4/131453810/8175574.pdfIn PDF document text
    • https://jetovalanowu.weebly.com/uploads/1/3/0/7/130739462/kukabazumum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451760/normal_5fc852560fbad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444623/normal_5fd7ec8349c8c.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/if10ijD/world_cup_qualifiers_europe_draw_date.pdfIn PDF document text
    • http://auto-agents.space/savogazofowxobv2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413373/normal_5fe786c1a38c3.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/gjoefO3/business_management_aptitude_test_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/r5ghEPG/dr_rockett_fairhaven_ma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F8 5096 bytes
SHA-256: af69b733fe1cd7e10f3ef3da9fe05a5589a20e247c9a831fad4514ac5286baf6
font_01_sfnt_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 10104 bytes
SHA-256: b66e2801a0313ea161ce9610848cfdc51abf5c1e03010c25b8bc97d5202cbfa3

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