Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7e6537b30dc52f…

MALICIOUS

PDF

82.9 KB Created: 2021-03-14 13:45:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5a0052697063b8da6731e279b8a361c1 SHA-1: b2bdc0db4a09178e980fc6ca514c86acc7c38a8e SHA-256: 5c7e6537b30dc52fced09ae322ba5e9470742f9140963ab3a94a352035d24ae8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. ClamAV detection and ML classification confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate it's designed to redirect users to potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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/award?keyword=cavum+douglasi+adalah+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379849/normal_5fe4a810db25c.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/roralu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_600fd94a94de7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470698/normal_604494dadf320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465907/normal_5fe99c5b9352a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465704/normal_601e8fd12d73d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_600f7aff07102.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370762/normal_6001d469061a7.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/95689193765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_6010cd27f2a6e.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_2439a55a54dc4308a8365dd28fb3f34a.pdf?index=trueIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_d912d0978d064b7392cbb8e77ea23242.pdf?index=trueIn PDF document text
    • http://nipujolejorekal.epizy.com/mesopadefobanivixemezaz.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_a97fbcdb60254145a83335bf452a95e3.pdf?index=trueIn PDF document text
    • http://bomepexajusopa.epizy.com/tenses_worksheets_englishlinx.pdfIn PDF document text
    • http://vawerudarasikow.myartsonline.com/gigafuxawaveg.pdfIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_917fd0503d934e3a804ad8419ff3c147.pdf?index=trueIn PDF document text
    • http://rikuworubit.myartsonline.com/cambridge_english_test_b2.pdfIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_93979eea32ef40a0af2f283651793907.pdf?index=trueIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_262c681c1269401c909b08cfd3fefd6c.pdf?index=trueIn PDF document text
    • http://pekufupudemolor.epizy.com/cartoon_video_songs_mp4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC29 1684 bytes
SHA-256: a8640cb23b15ac802f89dd0648c07b7ad030d8b62c5f78624c3814794ace58c4
font_01_sfnt_off0001048d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048D 5324 bytes
SHA-256: 149d0acb10488929a778aa493aeb055bb5e5f130907110d97734ab6ebcf6e4d2
font_02_sfnt_off0001168e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168E 11084 bytes
SHA-256: 7ed8d5d0887dc1d2a8342bd15b2b0e91d842d07946ba932e456c0192253cf584