Malicious PDF — malware analysis report

Static analysis result for SHA-256 a369cdd83c09ef5f…

MALICIOUS

PDF

114.8 KB Created: 2021-03-29 03:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3946ce8495e3d7ac5d49b4dae4133b20 SHA-1: 20a4c4b2c0fa5ddb5fac3e0f43fd596e88629b5d SHA-256: a369cdd83c09ef5f6dd2ce6d826a9daf66b0d0adab636917b7bcfdd155874f58
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable hosting, characteristic of a link farm designed to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

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 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/award?keyword=agnostico+definicion+pdf PDF link annotation
    • https://cdn.sqhk.co/letarezetap/gchdjaG/lolegafofapolad.pdfIn PDF document text
    • https://cdn.sqhk.co/tizalenifo/e4GkOib/running_shoes_for_men_asics.pdfIn PDF document text
    • https://cdn.sqhk.co/zelosoza/NmaIigv/backup_whatsapp_messages_from_android_to_icloud.pdfIn PDF document text
    • https://cdn.sqhk.co/bimonabozo/wEfgghd/low_oxygen_levels_normal_range.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/77iiWjW/hidden_voice_recorder_software_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/dubibuwa/hWD8ric/febotereronadutafon.pdfIn PDF document text
    • http://regumevikalu.iblogger.org/kambi_kadha_malayalam_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/hceggR0/gosaf.pdfIn PDF document text
    • https://cdn.sqhk.co/baponakazu/6hYIibK/shop_disney_coupons_august_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kidimezamos/jhaovhe/new_york_city_tours_bus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/52627444777.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/94600785929.pdfIn PDF document text
    • http://juxenemijoguku.rf.gd/prima_bucolica_testo.pdfIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_aab54e6e6db745af8d33c102e2f647e8.pdf?index=trueIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_354b8914288f45989408c6cc4f54a8d4.pdf?index=trueIn PDF document text
    • http://pojinagogaj.rf.gd/aqa_gcse_physics_energy_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/chakram_ringtones_free.pdfIn PDF document text
    • http://suxikikafib.epizy.com/44704182699.pdfIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_78acc8224031436894ffe12710f7dd59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/kriteria_sepsis_2016.pdfIn PDF document text
    • http://savagit.rf.gd/fuvitivedekanawibumamu.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_off000177e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177E7 4976 bytes
SHA-256: 3fda21497130849ccb883862fafd02dc78134ceb99208084dcd7965cb2691321
font_01_sfnt_off000188f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188F8 16148 bytes
SHA-256: 775a5d28fe5788123274c4b17367c0d8359c685e1c15c6066bdee34bca561f64

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