Malicious PDF — malware analysis report

Static analysis result for SHA-256 48bd42f53d8768d7…

MALICIOUS

PDF

78.4 KB Created: 2021-04-01 02:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07aa1ccc376e5ffbf2bbd866ff077965 SHA-1: eee5d272c3091d7c61ab9d7e9f0708fc95f91d0b SHA-256: 48bd42f53d8768d724f6f08e53f51c069a2813dc658bbb8f552bf8efd5e10c67
184 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with a high number of external PDF links, many of which are dynamically generated. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malicious content or engage in SEO manipulation. While no scripts were extracted, the PDF structure and numerous external links suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://samyog.ru/weruzelixababevovuzebuqq1tv.pdf
    • https://cdn.sqhk.co/saligoliti/VihihIp/2021_forest_river_arctic_wolf_321bh_camper.pdf
    • https://cdn.sqhk.co/kekagate/ihafojg/knowledge_is_power_game_characters.pdf
    • http://hackins.site/reforma_y_contrarreforma_resumenr4wmm.pdf
    • https://cdn.sqhk.co/vasibejovej/chbibyr/12358057250.pdf
    • http://ladyso.ru/budgeting_spreadsheet_google_sheetsan6wy.pdf
    • https://gamubojuteno.weebly.com/uploads/1/3/5/2/135299935/zepawikolod_fukiroroweli_ronokenaja_xepopanogi.pdf
    • https://mezepobavufu.weebly.com/uploads/1/3/4/7/134717124/2008704.pdf
    • http://francobusiness.com/sennheiser_hdr_170_wireless_headphones_manual6nmx4.pdf
    • https://sixojidolox.weebly.com/uploads/1/3/0/8/130814042/4158777.pdf
    • https://cdn.sqhk.co/nibedogoxov/Ajbiihh/degekitese.pdf
    • http://bcpzon4segurabetaviabcp.com/kaththi_tamil_hd_moviev36am.pdf
    • https://cdn-cms.f-static.net/uploads/4416791/normal_604cf35e564c3.pdf
    • https://cdn-cms.f-static.net/uploads/4477386/normal_600c20611565a.pdf
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/lutovugebiwuvor.pdf
    • https://cdn-cms.f-static.net/uploads/4415531/normal_6017b7163af3a.pdf
    • https://static.s123-cdn-static.com/uploads/4379387/normal_5fc6236d20461.pdf
    • https://kigazodiraju.weebly.com/uploads/1/3/4/6/134678535/431135.pdf
    • https://cdn.sqhk.co/venitalobeni/ichgWha/cute_anime_wolf_girl_pictures.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/n4t4wXRn-MA/wb?keyword=robin%20hood%20customer%20service%20hours
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_17bae4634a5b42bc90c8fb115d602f7b.pdf?index=true
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_e59280e4520347d397e2a7b392dad1ff.pdf?index=true
    • https://b3e719cc-30df-460f-a5cd-d2fa480fcfac.filesusr.com/ugd/b2b6a5_bbae9e363ba34b149e58460a3b9981f8.pdf?index=true
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_fb76b8c7819045359a4a2e7f6b80f7f2.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_off0000f489.bin
493f9ad9c481983439c95b0e3411cb254b2bdf54006f099d9dc3a7d292aaac65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 5144 bytes
font_01_sfnt_off000105e2.bin
782cafab68183c7b048dfc3158c65ff127fd60cfa5146600b7603a1c1884fb55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 11252 bytes

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