Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45fb01575a8c13d…

MALICIOUS

PDF

81.1 KB Created: 2021-03-25 08:09:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49e788aee0e5ed30a2dabca3b6b104b2 SHA-1: ba7d642d3e78e509992c3f96cba273a44c7bc9f4 SHA-256: c45fb01575a8c13dd4d5edaec3bdf09e42342aa0b0171edf954d1eb9ada8c007
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs point to suspicious domains, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/wix?keyword=go+getter+3+student+book+pdf
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/tamerigutitixuluguw.pdf
    • https://cdn.sqhk.co/pivugisaxap/WlgcNje/81958438613.pdf
    • https://motonolezigit.weebly.com/uploads/1/3/2/8/132814123/mofosiloxesun-jufewaj.pdf
    • https://zekasujiminog.weebly.com/uploads/1/3/4/3/134366003/kikiz_kopanatatova_mudavixi.pdf
    • https://cdn.sqhk.co/mazonixun/qhfagct/teacher_heartbeat_svg_free.pdf
    • https://jewakazakiven.weebly.com/uploads/1/3/1/4/131437085/firijufafomubezamog.pdf
    • http://jujiwaneko.iblogger.org/another_sad_love_song_piano_sheet_music.pdf
    • https://cdn.sqhk.co/kinanekoxo/iajg6jc/how_to_charge_irancell_sim_card.pdf
    • https://wipedevibenisi.weebly.com/uploads/1/3/5/3/135315865/95a979b54.pdf
    • http://kuzojud.66ghz.com/benjamin_franklin_scientist_information.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_86f4df9fdc9943cebe66fca22fee5ca0.pdf?index=true
    • https://s3.amazonaws.com/jeduzizonox/26902355997.pdf
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_ebf13c643d894eb7a6855e91aa396b72.pdf?index=true
    • http://zobozigeg.epizy.com/88143463946.pdf
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_567f52b046a8435081e29a224f8562e2.pdf?index=true
    • https://s3.amazonaws.com/pogolo/tenubulixojibag.pdf
    • http://pepojugatidi.epizy.com/el_resumen_de_la_biblioteca_de_babel.pdf
    • https://uploads.strikinglycdn.com/files/9a178e2e-9ed1-4eaf-83d3-8b924861c2df/introduction_to_gimp_2.8_tutorial_for_beginners.pdf
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_fc3b8f7d0d3d480a87852931a6ba8e6d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9af62dde-65a7-42f2-a4bd-80530e6e5ca8/hp_officejet_4500_desktop_printer_driver_for_windows_7_32_bit.pdf
    • https://uploads.strikinglycdn.com/files/b9839766-6d13-4a8c-8789-ba66f79ff094/how_to_get_free_itunes_codes_no_human_verification.pdf
    • https://uploads.strikinglycdn.com/files/d977833e-e8e2-4c34-9932-5cd915b778ac/kenmore_washer_wont_agitate_spin_or_drain.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f18d.bin
986dac7251537cf124663d9df1888f358d3928de38d70ece96b31f5fc835942a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 5364 bytes
font_01_sfnt_off000103e4.bin
b842a0b136ff955dd00fffec757aa6514036215a72390e1a65be03bbd92fb95e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 20064 bytes

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