Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1d111897921a1a…

MALICIOUS

PDF

78.1 KB Created: 2021-03-11 04:49:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: de4701ed29f8d9b05eea0b603ec6bbae SHA-1: 06078db72540b0651e89cfe085d946b426abf153 SHA-256: 3e1d111897921a1a6bbb9051f5898efdc2309576a13f4f1adb4a9f26aeef5134
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The document body, though heavily obfuscated, appears to be a lure related to search results, aiming to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://kuzutuzo.ru/strik?utm_term=how+to+find+density+with+mass+and+diameter PDF link annotation
    • http://remontlegko.info/life_fitness_95t_discover_se_treadmill_wifi_ready13lq8.pdfIn PDF document text
    • http://tevfikyuce.xyz/d-_day_75th_anniversary_history_channelvn73f.pdfIn PDF document text
    • http://bio-ita.fun/fanarikudevadezomgec45.pdfIn PDF document text
    • https://cdn.sqhk.co/pawiwodogu/krJmun8/vesej.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/gp7sicd/73479656804.pdfIn PDF document text
    • http://igcopyrightforhelps.com/651995188410c9na.pdfIn PDF document text
    • http://negozio50sconto.info/how_to_make_a_banana_smoothie_recipesten9g.pdfIn PDF document text
    • http://save50it.pro/57666344338tsgas.pdfIn PDF document text
    • http://xxlmature.site/newbluefx_titler_pro_templatesmaisx.pdfIn PDF document text
    • https://cdn.sqhk.co/kupibetefuko/xYieT6C/97580345212.pdfIn PDF document text
    • https://cdn.sqhk.co/banamasuvaj/VVNgjhi/easy_granny_square_pattern_diagram.pdfIn PDF document text
    • http://alcozerox.com/what_are_the_theories_of_criminal_justice_systemlg2zl.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/f6c2113e-b513-4618-a09e-75de5f2669ef/how_to_add_bluetooth_to_yamaha_receiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e048d08-ed7d-4ec3-ae88-0dc4bb8a3210/juzapulanelisededebafig.pdfIn PDF document text
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_a0c1c2c252e24fa8909a8cc457137628.pdf?index=trueIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_1889a02b338b45978299299aee7dee50.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/masevewi/clean_design_blog_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc251e7-c860-4914-896c-a955b1062f14/notas_de_titanic_para_flauta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d43ee851-50ea-490f-9698-a3b3e8ba1a76/windows_10_pro_for_workstations_iso_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/68798163108.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_c7ef9ab448dc40da97a5a7b1b80d6aeb.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E5 5268 bytes
SHA-256: 8832175e7424afdfb0df9c41d9bac9f2e672e0a806e67013c17452eb2caf8313
font_01_sfnt_off000103be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 11596 bytes
SHA-256: d160e671747f3cb3f143f7ab098d429385d1a3c23124077d11c7674884754cd4

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