Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1eb68bbeec36369…

MALICIOUS

PDF

79.0 KB Created: 2021-03-23 17:18:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5333a07ee79a7e1035342cbad81fca53 SHA-1: 50ccbda9f8e07b9d8f92f1cfc59271c09d3c7621 SHA-256: f1eb68bbeec36369e69186bbe25381b170a412b92bd3809ef0c89d01f3e4dd18
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are used to redirect the user to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/wix?keyword=the+lost+battalion+movie+worksheet
    • https://static.s123-cdn-static.com/uploads/4447433/normal_5fed7f3458649.pdf
    • http://linorusani.iblogger.org/64912821863.pdf
    • https://xufidevudog.weebly.com/uploads/1/3/4/3/134389214/jomalisij-ripelivopotamis-bokilusonelasi-tejujilok.pdf
    • https://static.s123-cdn-static.com/uploads/4485301/normal_5fcdbc7d54eee.pdf
    • https://tixowofo.weebly.com/uploads/1/3/4/5/134592641/dugowadimuzarutiveni.pdf
    • http://gilopenomugo.iblogger.org/arthur_kingsley_porter.pdf
    • https://static.s123-cdn-static.com/uploads/4403672/normal_6001e9d38c083.pdf
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/fezurilex.pdf
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fe6a5ffb979e.pdf
    • https://finirawex.weebly.com/uploads/1/3/2/7/132741073/2481741.pdf
    • https://static.s123-cdn-static.com/uploads/4497650/normal_5ff04924e8332.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_5ccbf7122ca14949b4ebf049a3dd8a8a.pdf?index=true
    • http://tumurubulofomam.rf.gd/student_attendance_system_using_barcode.pdf
    • http://fokerek.epizy.com/eclipse_java_j2ee.pdf
    • https://uploads.strikinglycdn.com/files/b00cb009-35f6-4a05-9987-45d810de4c56/gesabu.pdf
    • http://juvogexef.rf.gd/10918171365.pdf
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_f68ebee66a4f4c15a87004891c2a1afd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0c3efaa4-22ea-41fe-b7c5-1559c08c7f97/what_are_the_factors_that_affect_school_community_relationship.pdf
    • https://uploads.strikinglycdn.com/files/d170e74a-ae06-44eb-b58d-1396f422f75b/pokemon_fire_red_cheat_rare_candy_in_mart.pdf
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_7f816f73bb0b4ddfb3b66c29f13a167c.pdf?index=true
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_23a3514950754638a7526e6c2749fe84.pdf?index=true
    • https://baad1762-ad72-434c-be9a-9de7d8068d01.filesusr.com/ugd/61395f_a0cca0bcc7ed4510aeb05fa47ec8b63f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edbd.bin
b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 2900 bytes
font_01_sfnt_off0000f800.bin
77f5401d4ecff69d5f1dc24dbfbb53e43291449468905570450fb840603d6028		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 5232 bytes
font_02_sfnt_off000109af.bin
08de7ff4e75ef3679b5413e98de4d28129c6c23d95e83a1d8924c350c9f974f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 10284 bytes

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