Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5e6a682621e9e2…

MALICIOUS

PDF

74.1 KB Created: 2021-04-05 04:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0308b2fbaa0bbffb39d9069a06cad540 SHA-1: 590bfb525c5c7852d88f6a7c244732a46aa7eb43 SHA-256: 9a5e6a682621e9e24bafa0cea544fe59cd15a06549f5fde118db193272240950
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9997

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://vilenefex.ru/wix?keyword=worksheet+works+coordinate+picture+pumpkin PDF link annotation
    • https://cdn.sqhk.co/tabewinudeka/8X75hjk/4_pics_1_word_4_letters_handshake_cards.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/tumor_cabea_de_pancreas.pdfIn PDF document text
    • http://all-host.site/kuvempu_university_bsc_chemistry_syllabusgptjv.pdfIn PDF document text
    • http://wbigs.space/tabla_de_pulgadas_a_mm6d46y.pdfIn PDF document text
    • https://cdn.sqhk.co/befulirawid/m72YKpc/fenukomebutisumede.pdfIn PDF document text
    • http://life50it.pro/bojenotebarivilapepufiwac9p9u.pdfIn PDF document text
    • http://opensoda.pro/gebobolsh75h.pdfIn PDF document text
    • http://doucheop.xyz/air_force_academy_chapel_pipe_organnlj56.pdfIn PDF document text
    • https://cdn.sqhk.co/wetilusogaki/o4Z0Ln7/xagagokofizinupagemibi.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/convert_file_sang_excel.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/1a87940a-4175-4be5-b3ae-616b1f7ff31c/bivubivexugufutafusuwifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/977d0042-7166-4bbf-9286-f4028bff877d/31213247755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d1f765f-70d5-4397-be0a-3ee3311158c2/is_sword_art_online_anime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/530cfd98-1ffa-414a-b958-0e82bd887ece/psychoanalytic_diagnosis_second_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0bd4939-7000-44ed-b5f5-036ea93becb1/doxatiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd2701ce-439c-416e-84d9-089e0b5eba6a/cara_reset_wireless-n_wifi_repeater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43baa141-5840-4a69-ac2f-7a29400a7704/mesa_boogie_maverick_dual_rectifier_tube_guitar_combo_amp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2457c8de-3070-4a89-a0a4-175ff9422699/isotope_symbol_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc148e7-1bbf-4dde-bbb2-547e5fccb953/85395393958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff75219b-cae8-4de8-b19b-4f087cbd934a/neato_botvac_d80_hard_reset.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_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 5452 bytes
SHA-256: 1161db533069de14b19c2547dcc6123e6af4dc634970ec0bebb360a6e4dd8d6f
font_01_sfnt_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 11032 bytes
SHA-256: 44971a9639df3f5a92afcfc0e964ee0e1e1a307e2b683d2d7f9a3967a8c8e689

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