Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f091d690c5e618…

MALICIOUS

PDF

72.1 KB Created: 2021-03-23 08:29:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 99c2cf0963e015a3d340f7f2f41e899c SHA-1: ae4ab8a96447938dc517d8a5faa4aaa0054b2277 SHA-256: d1f091d690c5e618358d8b85a2e7fd5dbfef0bda58501e8915d62168fef40694
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, appears to be a lure for academic content, likely to trick users into visiting malicious sites for phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://druttle.ru/wix?keyword=maternal+newborn+nursing+reviews+and+rationales+pdf PDF link annotation
    • http://axecheat7.xyz/which_key_difference_between_lincolns_and_johnsons_reconstruction_plans_caused_problems_in_1865ym1wa.pdfIn PDF document text
    • http://duzixofiwisegi.mygamesonline.org/how_google_docs_works_video.pdfIn PDF document text
    • http://matcobzor.ru/nerizgemjg.pdfIn PDF document text
    • http://cosmeteca.com/slouching_towards_bethlehem_essay_listcvl47.pdfIn PDF document text
    • http://kodavuviguwu.mypressonline.com/80255677930.pdfIn PDF document text
    • http://wujasonuvilo.mywebcommunity.org/77854436947.pdfIn PDF document text
    • http://waneboto.66ghz.com/th_digraph_worksheets_for_first_grade.pdfIn PDF document text
    • http://prognoz-football.club/milkweed_book_sparknotes7l25n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490516/normal_6036f79e97e0e.pdfIn PDF document text
    • http://idealica-co.site/who_is_america_best_episodes0d87y.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/22937911136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490736/normal_6025a4187d526.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/86ee7ff6-1d20-494c-a22d-38b11834d4d0/how_to_fix_a_small_leak_in_oil_tank.pdfIn PDF document text
    • http://zewadomi.myartsonline.com/29924072328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38d3ea05-cd2f-47d5-bb0a-4c8121f1dd4b/xoponedelogubibibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6da348dd-49f0-4745-ac12-0c9a7120dbe4/the_professor_and_the_madman_netflix_review.pdfIn PDF document text
    • http://fapibudu.epizy.com/72199959424.pdfIn PDF document text
    • http://safefimij.epizy.com/year_3_science_worksheets_free_uk.pdfIn PDF document text
    • http://degefoxovovi.epizy.com/borefatesosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4bf1c0b-7600-4918-89c7-94e7a795b054/98808336811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f073fbc-8e62-41c1-b68b-1c1e8a552a9c/74360763479.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 5504 bytes
SHA-256: 4b60e7ef62ae9ee2ae689ddb9d35288c774b0181fd5dd2ec979c2ff889776f12
font_01_sfnt_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 11052 bytes
SHA-256: d0a08c67f72b674212bd660feb8cdc3bc953e26466cb21ec1fe9f42345351f61

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