Malicious PDF — malware analysis report

Static analysis result for SHA-256 525deb26c42e9357…

MALICIOUS

PDF

73.7 KB Created: 2021-02-19 07:01:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6897fddc6123b1cb9783217e1315ed3e SHA-1: 7117641e68f2dab80b60e767346ea996ddb76520 SHA-256: 525deb26c42e9357a87cbe4c7655006c6a8ef9efdb478575b0a70d573a0ce3aa
184 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to disposable domains and are used in a link farm. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically `https://crophysi.ru/strik?utm_term=how+to+get+in+the+music+industry+as+a+producer`. The ML classifier also flagged this PDF with high confidence. The presence of embedded URLs and the link farm structure suggest a phishing or malware distribution attempt.

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://crophysi.ru/strik?utm_term=how+to+get+in+the+music+industry+as+a+producer In PDF document text
    • http://taptopbot.com/dogodob001j7.pdfIn PDF document text
    • http://digitalcalakk1.xyz/50904812217c8lel.pdfIn PDF document text
    • http://wwnews.site/84307839286e3ere.pdfIn PDF document text
    • http://mobile-media.moscow/211184947073kd8o.pdfIn PDF document text
    • http://antileqphh.site/space_shooter_mod_apk_unlimited_diamond75qsh.pdfIn PDF document text
    • http://bilapak.66ghz.com/asterisk_server_configuration.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386834/normal_5fecca41d5197.pdfIn PDF document text
    • http://alluniversity.fun/pewujagikagilinosokemq42lk.pdfIn PDF document text
    • http://eliyalte.com/english_grammar_book_for_class_9_downloaddsrz2.pdfIn PDF document text
    • http://1offpark.xyz/u_dictionary_app_offlinehxu4o.pdfIn PDF document text
    • http://albatros-trans.ru/fruits_and_vegetables_having_vitamin_dwbhm3.pdfIn PDF document text
    • http://buyfastedcircle.xyz/ejercicios_resueltos_transistores_bjksgl2.pdfIn PDF document text
    • http://myluckywin.site/topuburomuzutujebadip4b2xl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385038/normal_601474a91dc67.pdfIn PDF document text
    • http://ellmax-site.xyz/pigutedutx4rtv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450156/normal_5fdad7316121e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuzipani.rf.gd/56832747712.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_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 5608 bytes
SHA-256: a25e703d5291276d46d2ebabeb07520ce7400b78f6e14ea9fc14067c7a2a40e7
font_01_sfnt_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 10368 bytes
SHA-256: 9a15fb6d9814678e44b4682c241f818166b4d346841cce4ca09d15317d8c235f

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