Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71f34961010d00a…

MALICIOUS

PDF

79.2 KB Created: 2021-03-31 09:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e8390e9f6bc4ad36c3f6c8db9588ea48 SHA-1: 76036bdd9b11d6e82aaffa3243f4b1a64abd1c4f SHA-256: e71f34961010d00a218b17acb090e5fd31f725d456b5c176cb907e12f70acb31
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure and a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=cercidium+praecox+pdf In PDF document text
    • http://marketitaly.info/minn_kota_terrova_i_pilot_remote_problemsf7ouc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460476/normal_6063975992a61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489441/normal_603f5f7f1570e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485454/normal_605eeb5388cc0.pdfIn PDF document text
    • http://antileqphh.site/89990201870yk8ri.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/65966454247.pdfIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_2807b556d3e74eb0aab196f38541093f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7d5f203-7d4d-4d5e-9e1a-79a4539999d4/50514599821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/003fc3a6-6faf-4c0c-b2ee-e10301765394/integrated_chinese_level_1_part_1_lesson_4_workbook_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f790cfaf-4561-406b-b326-ecce843f6789/introduction_to_computer_system_class_11_ppt.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_bf6e657f11974f53aac90172905e423c.pdf?index=trueIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_1bde75cee0654613be56fdc813247fed.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_5596b0eeb23d4d84b0a7a2516ef35562.pdf?index=trueIn PDF document text
    • http://mifedisiso.atwebpages.com/xivijakawevibavurasebavis.pdfIn PDF document text
    • http://forezepolutaju.onlinewebshop.net/brief_answers_to_big_questions_stephen_hawking.pdfIn PDF document text
    • https://e6343aec-df69-40e7-9959-3c0c55bf73c9.filesusr.com/ugd/6a9017_4a306a8428e04353adb69cda45c2d43c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sezebepit/is_star_citizen_worth_buying_2020.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_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 5064 bytes
SHA-256: f136f47f126b5d8b1bea104ddf0dc10b2242a20add4068f507c40949ca09aa7b
font_01_sfnt_off00010810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 12180 bytes
SHA-256: eb4a40aadb1190c5007c99cd1c0e3edc58a643a7ef454ba4d46ce3e05c511d37

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