Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61ea4dbf80e8ca5…

MALICIOUS

PDF

84.6 KB Created: 2021-03-16 01:52:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 16ba88168734c5c8e247755c3c46355a SHA-1: 3ae222f21af162e20087729b0458cbda7b797933 SHA-256: f61ea4dbf80e8ca5cd8d970cadd6292f503dd711f1053210e6bc8886d8906886
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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 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://ponafet.ru/wix?keyword=commedia+dell%2527arte+lazzi+scenarios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381978/normal_602771ae12e76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408862/normal_60271ffea89fd.pdfIn PDF document text
    • https://cdn.sqhk.co/xiruregexibe/hVT0jgy/quickbooks_inventory_adjustment_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471235/normal_5fed1620547e8.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/ii7tbJy/stage_4_pancreatic_cancer_survival_rate.pdfIn PDF document text
    • https://cdn.sqhk.co/xexogataza/javohcw/teaching_strategies_webinars.pdfIn PDF document text
    • https://cdn.sqhk.co/wafifovuwel/FieVhjg/pizza_and_wings_near_me_open_now.pdfIn PDF document text
    • https://cdn.sqhk.co/movijomo/e6hdBgg/53249347395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426971/normal_600c2ad94c4ba.pdfIn PDF document text
    • https://cdn.sqhk.co/mofipife/Ahc5Njb/download_destruction_tuber_simulator_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/gjLge1t/zetututonujabutopenubug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417030/normal_6007c512b3f9e.pdfIn PDF document text
    • https://cdn.sqhk.co/salijuvam/Mhdlgg5/can_knockdown_level_4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415964/normal_60361ecc3f3a8.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzelapivoku/jgKv64l/2648947433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455178/normal_603edbd73d3e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482882/normal_602fc8ee9c0cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475719/normal_5fffc360ae679.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450257/normal_5fece9e1d512c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483839/normal_5fd8fba055c12.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/ghgei52/little_boy_short_haircuts_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_2ccfd9ca37ab4d788390e3ab5ca75d4b.pdf?index=trueIn PDF document text
    • https://527ed197-5826-4432-9c89-449afa9d705e.filesusr.com/ugd/65ef70_78905edfe2684311ae2e5211d1aa201d.pdf?index=trueIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_47694a7987334f42b46dae3189187a7b.pdf?index=trueIn PDF document text
    • https://af8e4364-7f8a-45ec-af3e-d69da1c27fbb.filesusr.com/ugd/12c36c_c0f06de40d7444b7926f9cd0666c59fd.pdf?index=trueIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_5387bab6f0504aa0b4f71657a3342477.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_off00010c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7C 5076 bytes
SHA-256: 9da8001c3f799fc1c567e52a2f01a390a89e14793c7c7da4ef30132a601fa827
font_01_sfnt_off00011daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAA 11056 bytes
SHA-256: 68d488b664ef2ff1f04d61854ae2f2c95507270228a5df234bb94d929aca2353