Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb21436ff231a869…

MALICIOUS

PDF

138.0 KB Created: 2021-03-25 05:20:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5e0dac8c6f1d16767bf20784e740ca2e SHA-1: b1da418153c315995cbd1e0cf82247aba2c87a9f SHA-256: fb21436ff231a86953eb0787f5e52bb51fd6bd743caa28add314b23611dd79f3
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-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://kuzutuzo.ru/award?keyword=articles+on+education+in+pakistan+pdf PDF link annotation
    • http://goodsfor.life/femewabinibikapidom3nm77.pdfIn PDF document text
    • http://8gusevshop.space/heading_matching_exercises_ieltsfhose.pdfIn PDF document text
    • http://kumululurug.scienceontheweb.net/wuzijidajazowefewifiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472773/normal_6004eb940f2ed.pdfIn PDF document text
    • http://scrlt.xyz/98886295698iv9a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487665/normal_604dcb137e337.pdfIn PDF document text
    • http://tugrull.com/97683933686mozg3.pdfIn PDF document text
    • http://nosixavol.sportsontheweb.net/falok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413987/normal_6017aeb109402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478131/normal_601315c9607e4.pdfIn PDF document text
    • http://f13x.xyz/fibisidivu5trb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486758/normal_60588e9b10d9c.pdfIn PDF document text
    • http://tenegijo.iblogger.org/over_the_garden_wall_beast_true_form.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/articles_of_faith_james_e_talmage.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/bfa97d04-d83d-4d5a-a9e7-312474399f27/infinix_note_7_price_in_nepal_6gb_ram_128gb_rom.pdfIn PDF document text
    • http://lazavosapazogil.epizy.com/zisomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e6f1391-d51d-4c84-9215-3af67cce89c6/1880949585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/860276df-a1b5-41af-9764-51d0bd31feca/army_golden_master_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/746c2290-0dde-4633-8113-a514dc16e295/english_for_business_studies_teachers_book_second_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be452915-fa78-45d9-b5aa-beb5878801dd/cellular_respiration_lab_results.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001f738.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1F738 21284 bytes
SHA-256: 7bc3a4a8aa2228ad85f0b3e8c993b8514ae61ca9f226b9249fd9a1ea4cffc666
font_00_sfnt_off0001be5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE5B 5200 bytes
SHA-256: 122a9ecae4a22a79d0468b50f19aab57f3a8546b54fbc57aa998947048038cb7
font_01_sfnt_off0001d01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D01E 11412 bytes
SHA-256: 7d7fc4ee23fed0ebf9e5b639a2fccf75221cc28fef061dac3c7ac66b34425061

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