Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be02d0775bb7fa1…

MALICIOUS

PDF

85.5 KB Created: 2021-03-29 22:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d72213956854708b10367dfee56495ef SHA-1: 3e307cab0cd125fc3ddc96f88aef56596484b07d SHA-256: 3be02d0775bb7fa1e22417a00004b5013b00aa192c183723140b008ba0357e15
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/123?utm_term=afterlight+apk+full+ios PDF link annotation
    • https://cdn.sqhk.co/dosazuleg/ggojeXq/improving_your_project_management_skills.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/WVjdjhw/monster_farm_jump_game_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/hc4XMif/r_type_2_arcade_rom.pdfIn PDF document text
    • http://micrometer25bill.site/91735777252cfo1f.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/ggyk624/17468123323.pdfIn PDF document text
    • https://cdn.sqhk.co/bozogekeji/CLif9qa/macos_set_default_music_player.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/ghLkvia/11387274184.pdfIn PDF document text
    • http://copyrighthelp.info/nier_data_on_the_old_worldumb0k.pdfIn PDF document text
    • https://cdn.sqhk.co/beratinuga/yCxrUia/xarifexuwuzafewozizewib.pdfIn PDF document text
    • http://sodalabs.club/search_only_files_googleysr8x.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://vasezasu.22web.org/feedback_form_for_parents_workshop.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/bHZp8hh/43193630244.pdfIn PDF document text
    • http://prognoz-football.club/how_to_activate_speakerphone_on_panasonic_cordless_phoneh1ghn.pdfIn PDF document text
    • http://greatmasters.biz/zinatopewidubojebusimig7k73k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_a748cb28103f4011abbae8e232618349.pdf?index=trueIn PDF document text
    • http://biwewoxowimin.rf.gd/45163027782.pdfIn PDF document text
    • http://gadusevi.rf.gd/l_adjectif_interrogatif_exercices.pdfIn PDF document text
    • http://lavodusepigixu.rf.gd/77993658663.pdfIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_ad861f2630e94b088b01dbfea5fb034a.pdf?index=trueIn PDF document text
    • http://julifoz.epizy.com/original_dd_books.pdfIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_8906a580ad044db2b9e8f85849f6eba9.pdf?index=trueIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_44f6d4996a7a4cc385faaf4f720a865b.pdf?index=trueIn 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_004_off000127b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x127B3 19232 bytes
SHA-256: 8e55d45d314d68b40618a78124f2b791195940d013008ee6488046d91ef85823
font_00_sfnt_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 5216 bytes
SHA-256: 5470c974d1e27db37bdb8952ba6c635b2b3a8382e1da30b1787faf8223e7d5ae
font_01_sfnt_off0000fef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 11864 bytes
SHA-256: 8e3d935a8be499df46361b495b08a3c8ecfe9f5ba466f0a9330be9f2abffb850