Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5f17bcb5670419…

MALICIOUS

PDF

91.5 KB Created: 2021-03-31 01:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d5e58f9db703bf90c2cefac8de04736c SHA-1: 9ed7c554d543b30befc015ed3a00a4e221a0196e SHA-256: ca5f17bcb56704191fd7991a0829bcdab58f1802172e771e66a97dcc01d0a9c9
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to PDF creation and potentially misleading keywords, reinforcing the lure. No scripts were extracted from this sample, but the overall structure and URL analysis point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7541

Heuristics 4

  • 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
  • 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://midufefew.ru/award?keyword=arduino+program+tutorial+pdf PDF link annotation
    • http://idealslimitalia-oficial.site/how_to_stop_climate_change_in_australia1vd5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453907/normal_6014904ecad57.pdfIn PDF document text
    • http://kalavar.xyz/83860916345ozfo3.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxunoromi/s9jduOG/warriors_smash_brothers.pdfIn PDF document text
    • http://iclod.tech/xizimiles2saxb.pdfIn PDF document text
    • https://cdn.sqhk.co/wanadujogo/hgo45n6/45002083288.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/W4xwegf/iron_man_mk50_robot_game.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/libro_el_bardo_thodol.pdfIn PDF document text
    • http://letnesil.xyz/sorimimenewuwio6eyi.pdfIn PDF document text
    • http://vinnipoh.fun/guess_how_much_i_love_you_baby_shower_giftpiit8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443341/normal_602c4b479ba9b.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/HwCybif/paint_pop_3d_online_game.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/jHDcha5/fuganufukupod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/mathematical_proofs_philosophy_examples.pdfIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_2bb90d26016d4ad79e0ccbe00746ae4e.pdf?index=trueIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/ejercicios_mediatriz_y_bisectriz_5o_primaria.pdfIn PDF document text
    • https://92fbd7ca-8480-4723-bb2c-19523f9dca15.filesusr.com/ugd/29946e_423aa6377cda4d21a2baa90b570d10c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d4150c-4992-4a05-89bc-6d2cfa571e81/41956388950.pdfIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_b99b4fdcfb864ccdb26d85a7a2664743.pdf?index=trueIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_2e216ebb39b24d4291c1afeb34677fe7.pdf?index=trueIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_1a6866cfb01043669bae874deff1dfbf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a1d5a51-0044-42a4-ad9d-978d2b344bb1/xibijipasi.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14378 5172 bytes
SHA-256: bb1b7dd5608bcffa3329024a8f6daac13a3915f956cd7531f69bfeb65e27b182

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