Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3508880ecdc2b82…

MALICIOUS

PDF

128.2 KB Created: 2021-06-06 00:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2c1e1b46e55e6d3848ee36da096a593b SHA-1: 7549fc998ea6d21dd0320209bcb8a8e516b1b888 SHA-256: c3508880ecdc2b82dfffcd7392da381a97f0acefec6123956a828d42ac32ed9b
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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/123?utm_term=focus+group+discussion+summary+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448115/normal_6052525fce3b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460981/normal_602a2e4d44688.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449009/normal_60011ac3ba1ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500183/normal_5fd68b1ec3f83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448331/normal_5fdb3e334c0b5.pdfIn PDF document text
    • https://rilavowa.weebly.com/uploads/1/3/2/7/132740415/xeminigo_dadosidurewoga_mimasokafupu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470960/normal_5fcfa2ec7f750.pdfIn PDF document text
    • https://vovavurag.weebly.com/uploads/1/3/0/7/130739927/4766813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394062/normal_606035b2706b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakiluxodev.pbworks.com/f/bayapada_venam_da_mp3_song_download.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/f/gadevumiberedosakuju.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144419397/my_brilliant_friend_elena_ferrante_review.pdfIn PDF document text
    • http://mujusevo.pbworks.com/f/ghost_of_spirit_bear_book.pdfIn PDF document text
    • http://ruxafonan.pbworks.com/w/file/fetch/144686388/53732146865.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/f/carrom_king_mod_apk_rexdl.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/f/78383415293.pdfIn PDF document text
    • http://redelaw.pbworks.com/f/72874906450.pdfIn PDF document text
    • http://vibevekofano.pbworks.com/w/file/fetch/144584031/tumimajozutozix.pdfIn PDF document text
    • http://guleribiko.pbworks.com/f/why_does_my_cuisinart_coffee_pot_leak.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144443427/ruziwilofakumomifivoxib.pdfIn PDF document text
    • http://gegoxelaw.pbworks.com/w/file/fetch/144687489/78566158324.pdfIn PDF document text
    • http://vomuseteweto.pbworks.com/f/1993_kawasaki_bayou_400_4x4_repair_manual.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/f/fahrenheit_451_full_movie_1966_free_download.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_off0001b738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B738 5416 bytes
SHA-256: 0cd7f1527c582ec7c30e3131483b859f1f36c4aa045d92dd9f6a93eba02555a0
font_01_sfnt_off0001c99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C99B 12360 bytes
SHA-256: 94d3104fd87f390d58c1cef64965aae2a6cb8baace3f9a4076c00dba64ff2092

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