Malicious PDF — malware analysis report

Static analysis result for SHA-256 306484edffb226c2…

MALICIOUS

PDF

84.1 KB Created: 2021-03-31 01:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 671691adb28c458ac01a0286809710b6 SHA-1: 41f5b66f3a5b205e535aa64784d55845387c71b9 SHA-256: 306484edffb226c2e754d94eb95b6ea507d8bde5894c66557b1b0701732be370
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm with numerous external URLs, suggesting an attempt to redirect users to potentially malicious sites. The document body, though heavily obfuscated, appears to be a lure related to English exercises, likely to mask the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/award?keyword=englisch+passiv+%25C3%25BCbungen+klasse+9+pdf PDF link annotation
    • https://zibefaxad.weebly.com/uploads/1/3/4/5/134594794/fupeno.pdfIn PDF document text
    • https://badobokitevobux.weebly.com/uploads/1/3/0/9/130969603/2583147.pdfIn PDF document text
    • http://xagugudel.sportsontheweb.net/xugewigemefanowidok.pdfIn PDF document text
    • https://bisigategisabuv.weebly.com/uploads/1/3/4/8/134884720/b63cf66878cb7.pdfIn PDF document text
    • https://fepexugoroba.weebly.com/uploads/1/3/4/4/134469665/7837707.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_d89a102cb6e54c6a993efdac6986f659.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/917c5588-e45b-4ca1-8e41-01ed6442bff8/5082446756.pdfIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_8f2217cefc744b2289e8a22a53b90b59.pdf?index=trueIn PDF document text
    • https://3012fa3b-51b7-4264-898e-e15d6fab1eb1.filesusr.com/ugd/ee5524_6fe81aa7a5924d278b29887edf3db276.pdf?index=trueIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_615acb4b9c9048dab2c4b950dd5abdf0.pdf?index=trueIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_30aac55905fd4f4988b27774d3d3ba1a.pdf?index=trueIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_ef58c65e68c24351bc89c53146f814b2.pdf?index=trueIn PDF document text
    • http://tososite.onlinewebshop.net/past_simple_affirmative_exercises_perfect_english_grammar.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_399da16daefc47bf9022827533ed464b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1fc8210-a0c1-4af8-9dca-655e465ce393/geometry_find_hypotenuse_right_triangle.pdfIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_19421f8fdbd94f4b94b5afc782c6765c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe744ba0-d164-4e63-8e25-a4f0d6725380/graphic_designing_online_udemy.pdfIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_00107c9234a44728ae6d3889de25f756.pdf?index=trueIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_de4f1dc66e37427388923a3057047826.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_04305e063ca24b4bbb83ddab657a9ec7.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 5820 bytes
SHA-256: 1965bc2ccf51d4984fdf1969584ccc95c4c80dea7d6b4856750d7faa7dd11ffc
font_01_sfnt_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 12164 bytes
SHA-256: 20cee187d16a60e9021e82110b2bfd429a3b0bd8ce675d2a573550c7dc34c059
font_02_sfnt_off00012b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6C 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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