Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92b9b191ce9bae6…

MALICIOUS

PDF

75.7 KB Created: 2021-05-06 12:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd75deeb137a9622cd0065649a406116 SHA-1: b7e63b5d2c8085a6cc16b2ed286492bb5d2a8c8e SHA-256: c92b9b191ce9bae6336ee7010628cb41b8e958e2e269f1bf9b5720088a8556cf
196 Risk Score

Malware Insights

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

The PDF contains multiple external links, with one specifically mentioning a refrigerator issue, suggesting a lure to a phishing or malware site. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and a link farm heuristic further supports the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/strik?utm_term=my+whirlpool+refrigerator+will+not+dispense+ice
    • http://fortuneo.biz/19883901305r08yx.pdf
    • https://cdn.sqhk.co/pinofizulag/gat45ic/tewifukufedosilixeguvax.pdf
    • https://cdn.sqhk.co/joxusozomilo/3hdibhe/guided_math_conferences_by_laney_sammons.pdf
    • https://cdn.sqhk.co/sunomedude/MZidZZz/zombie_killer_costume_ideas.pdf
    • https://cdn-cms.f-static.net/uploads/4421201/normal_600c9c55bb31f.pdf
    • http://kinoogf.space/xusobukk0078.pdf
    • http://picsonair.com/the_monkey_king_4_full_movie_in_hindi_download_movies_counternr5z0.pdf
    • https://cdn-cms.f-static.net/uploads/4471455/normal_603208c8b3d60.pdf
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/ba031e.pdf
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/gusuligetokoke-gokunodon.pdf
    • https://woxazalaxit.weebly.com/uploads/1/3/4/2/134235403/15c68ac3cca3a24.pdf
    • https://rasajelisulozin.weebly.com/uploads/1/3/1/6/131637016/1417160.pdf
    • https://cdn.sqhk.co/lewonuvaxu/1IdgilD/country_music_radio_channel_australia.pdf
    • https://cdn-cms.f-static.net/uploads/4420906/normal_60463f465f777.pdf
    • https://cdn-cms.f-static.net/uploads/4459180/normal_6030d00d2e42a.pdf
    • https://cdn.sqhk.co/ranotigu/gjXhghd/lords_mobile_dressing_room_full_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bejenosugede/midejibulatovowiwigozek.pdf
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_423f28f1a9dc430bb4b24a908bed2dc2.pdf?index=true
    • https://s3.amazonaws.com/xetasif/what_are_chinese_sky_lanterns_used_for.pdf
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_5010f71de8834517b4ea1e2a1d51646e.pdf?index=true
    • https://s3.amazonaws.com/mikibetiv/vofizinusetokalesumijub.pdf
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_459cbe9910014648978756b4921d154d.pdf?index=true
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_3781156c720d4c4c81359f8f2ebd1439.pdf?index=true
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_814082b799014546929f11e6a773af6f.pdf?index=true
    • 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_off0000e9b7.bin
aa863ea8475a47b7f4dd8538a4e42774b94898023b75e53239a2b13e739862f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 5616 bytes
font_01_sfnt_off0000fcf6.bin
c9fe428bd9bd6dd75fff882b42918075982f1de6cd5c3f04474cdde6b6bd0719		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 10452 bytes

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