Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c776b09ecd299a6…

MALICIOUS

PDF

81.2 KB Created: 2021-04-01 17:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5cbb7fee0d4026ce3480378ec19aed92 SHA-1: 3f09414d7ada74eedf36b85f2c189fe061975853 SHA-256: 4c776b09ecd299a678d830be772bc01d92db45b24b1993c771045ed965f60d63
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/wix?keyword=eastbound+and+down+parents+guide PDF link annotation
    • https://lulujazopo.weebly.com/uploads/1/3/4/7/134769354/56bbb0ef96f2.pdfIn PDF document text
    • http://takimopunize.22web.org/84372860877.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416493/normal_5ff4271761403.pdfIn PDF document text
    • https://godobinoka.weebly.com/uploads/1/3/0/8/130815080/f47197c00c5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_601c67ff4b856.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/68ed1f886cbee1.pdfIn PDF document text
    • http://gesamakim.22web.org/43454126242.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475582/normal_5ff0d5a8d8229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462775/normal_60100247d4703.pdfIn PDF document text
    • https://gofazawadatefit.weebly.com/uploads/1/3/5/3/135349405/6243498.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_7a329f2798c14364ba41545d396115d1.pdf?index=trueIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_77d932f2d2ca488b83d104bd8df005bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/seriposuj/what_is_the_best_3_bank_battery_charger.pdfIn PDF document text
    • https://5c126656-fc4f-473b-8c99-11744d2e1b96.filesusr.com/ugd/abd8ec_b6088a8fed5b4ef49e8a9f94a3a0553f.pdf?index=trueIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_60c3047d599d473abe68494dbdf367b9.pdf?index=trueIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_ed66e8a0cf744885be049f3dc42cc0fd.pdf?index=trueIn PDF document text
    • http://filipebed.rf.gd/29700212440.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_0d34ba62d1874ac7936b183aea2f0f84.pdf?index=trueIn PDF document text
    • https://cd8fad78-6a19-43c6-878c-830d169ee42d.filesusr.com/ugd/ff0d91_143e18a6e35242b0b58e4226fc3aef20.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pisedij/webasto_gasoline_heater_high_altitude.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/best_annotation_app_for_android.pdfIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_16d773c932544fabb886f94bd2e5ba8e.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_8c4eb2ab35f243e5857ef8398565a2aa.pdf?index=trueIn PDF document text
    • http://nudenagazosizav.epizy.com/android_9_vs_8_battery.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 3396 bytes
SHA-256: 9542a116d138b265c4882f9113d19e3c4f43916f31be220c94b7e8e87dc6e563
font_01_sfnt_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 5284 bytes
SHA-256: 964a158a312e08591ca1149414ad5c94145e168048c42eca0d887d33cf792c04
font_02_sfnt_off00010d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 11720 bytes
SHA-256: 076ecd4b7938c83284c5d3f5cc1c8404936a1bdf9104ac55b4cc7eff1cb20118