Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20fa0fff1147169…

MALICIOUS

PDF

97.4 KB Created: 2021-03-16 21:22:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 50d8b5d2f1d9b5be16c700e18661043e SHA-1: e95a7fa9ad3abaf4d9b8ff25790a99de6f6b31b6 SHA-256: e20fa0fff114716912c3e514989aa85c971aba69b0d9654bea935214b7156271
184 Risk Score

Malware Insights

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

The sample is a PDF file that contains numerous embedded links, many of which point to disposable domains and known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, references 'Davis's canadian drug guide for nurses', suggesting a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/strik?utm_term=davis%2527s+canadian+drug+guide+for+nurses+17th+edition In PDF document text
    • http://gutagige.sportsontheweb.net/linujevigigokikun.pdfIn PDF document text
    • http://solent.bar/black_desert_online_musa_gear_guidermj0h.pdfIn PDF document text
    • http://hotloveme.online/nh_ng_clip_tik_tok_tri_u_view29r82.pdfIn PDF document text
    • https://cdn.sqhk.co/melalisopapu/dagcMbB/my_planet_earth_my_responsibility.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/arduino_tutorial_tutorialspoint.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/hbrKtxC/55409862495.pdfIn PDF document text
    • https://cdn.sqhk.co/molivovuki/otPFEij/59577290944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_5fd81989444e8.pdfIn PDF document text
    • http://domsale.xyz/49242940153qtw38.pdfIn PDF document text
    • https://cdn.sqhk.co/nexapebevux/czRgghh/nimufiwowuxuke.pdfIn PDF document text
    • http://avtoshtorki.shop/like_love_hate_worksheetgq6kc.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/how_many_calories_are_in_a_sonic_pretzel.pdfIn PDF document text
    • http://e-devletturkiyeaidatsistemimgovtr.com/startup_ranking_framework_2019fa1xj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_600f32ee2e1bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370541/normal_602897f2535d7.pdfIn PDF document text
    • http://kevakigev.medianewsonline.com/augusto_cury_felicidade_roubada.pdfIn PDF document text
    • http://lisolu.org/casio_illuminator_price_in_nigeria6b0l2.pdfIn PDF document text
    • http://madewithsunshine.com/edpuzzle_answers_key_hackuayie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_b2860f0b90e4455da6ab9acb54327bdf.pdf?index=trueIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_4fa1838e0f8f44f09a5947d858f09046.pdf?index=trueIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_013790e452394501b93c2c17312ab3ff.pdf?index=trueIn PDF document text
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_40bd6aebbfe349088e6a13f5997959c8.pdf?index=trueIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_2e58c6fc7ec3430c9d4582a4864454f9.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_off00013879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13879 5476 bytes
SHA-256: 49900f5286c2de171c60a1893d6eac32c296ccd2ce2afd7625dd74edc4b52d53
font_01_sfnt_off00014b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B35 13384 bytes
SHA-256: 25fbc27e965671e8fd3f9ac21e22c56853a806e769e88ff26b30965c6d8f685a