Malicious PDF — malware analysis report

Static analysis result for SHA-256 be10ed7b03c2162b…

MALICIOUS

PDF

72.9 KB Created: 2021-04-01 03:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a74f0a296e4f83a46dc63cfb9a7f8f10 SHA-1: 11b6041f574538aa6a024e215086d39a8973a45e SHA-256: be10ed7b03c2162b5354e34decc5b835f8b85acb8f3332358ea9c30622f92c0b
186 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs suggests an attempt to leverage external resources for malicious ends.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://fokemale.ru/wix?keyword=kitchen+search+word+search+answers PDF link annotation
    • http://musofiron.ru/wivolezojuwi9ci35.pdfIn PDF document text
    • https://cdn.sqhk.co/belumozobu/jN0gh7a/dubibuforapudavoperez.pdfIn PDF document text
    • http://techanomic.com/the_exorcist_remake_2016gpxvn.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/AjjSoie/rdr2_cougar_hunting_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/ghhchbx/29582795127.pdfIn PDF document text
    • http://golomashvanna.xyz/arabic_english_bible_free_downloadpus13.pdfIn PDF document text
    • http://ketadiets.site/5747014579l8laa.pdfIn PDF document text
    • http://stalekost.site/musica_de_treino_rocky_balboa185zu.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/gg5T7LM/free_offline_slot_games_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/lizasizova/gicjbhi/41485232829.pdfIn PDF document text
    • http://bitcoinov.site/sesarefime6osze.pdfIn PDF document text
    • https://cdn.sqhk.co/dulemokel/jieybLS/56557248572.pdfIn PDF document text
    • http://autoupgrade.website/geworekefujaxaofig2.pdfIn PDF document text
    • http://zdorovienashevse.xyz/60873185844uickm.pdfIn PDF document text
    • http://ompala.store/28884771565yuuhn.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/hjifjbx/fps_commando_shooting_3d_mod_apk_download_uptodown.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_e8b2d977e22a4b009824329141368dd6.pdf?index=trueIn PDF document text
    • https://a1b876fd-e98f-4594-996d-fc523792ae9e.filesusr.com/ugd/efcbf0_38a30ec65aef457e85eec4ec6bed1221.pdf?index=trueIn PDF document text
    • https://eeebefec-a839-4a3a-9f85-40791d64ec9d.filesusr.com/ugd/4cd51e_e1cad2479f3a4daa9d1d5435f71c441b.pdf?index=trueIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_a49853ca14404e1aabef88881b420a00.pdf?index=trueIn PDF document text
    • https://56c41596-c8b3-4aa7-a075-23c9724d7f97.filesusr.com/ugd/ed77b2_e2e16d290bf848bc8a1041e69274ac42.pdf?index=trueIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_7cb3c44e438d43dd810b7e04e83232cc.pdf?index=trueIn PDF document text
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_86a9178a01044600a7d4d6b35ad53ad6.pdf?index=trueIn PDF document text
    • https://89e1056b-8c01-44a4-bea5-a80a497d444f.filesusr.com/ugd/6db6f7_fe7059121d5844578715c12cdbbf129a.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 5056 bytes
SHA-256: c02700d58f8dcfeb88f2a30640244023ac7c51c27d4d6c1c61b5afd1e1ea06ec
font_01_sfnt_off0000f1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 10748 bytes
SHA-256: c3f1a601354d8426bc3097de4ae09c436485ff1910cd4714e03e2fdf947fdbe0