Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28c3de5b1aaae36…

MALICIOUS

PDF

115.2 KB Created: 2021-04-07 10:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7a1d1c17a97b5084f52ee105052c166e SHA-1: 3df06c435914c5c9680e088cce292fe96e47154b SHA-256: e28c3de5b1aaae36a57be0a02c150a950230c29779678cc180df867d6a4e95a0
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, such as 'dafemum.ru'. The document body, though heavily obfuscated, suggests a lure related to 'cancer chemotherapy book pdf'. The presence of multiple unknown URLs and a high ML classifier score indicate a malicious intent to redirect users to potentially harmful content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/award?keyword=cancer+chemotherapy+book+pdf In PDF document text
    • http://dehydratedoriginalgoodness.com/sudebugagapavugi6id0l.pdfIn PDF document text
    • http://ipoteka.net/active_listening_skills_for_teachersphmmy.pdfIn PDF document text
    • http://myluckywin.site/80133954644yk5eu.pdfIn PDF document text
    • http://bupetud.xyz/1033435534injzz.pdfIn PDF document text
    • http://pokemonrivals.online/35601031887gbmju.pdfIn PDF document text
    • http://sreda.city/barejemiperid4z97u.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/bepukuba/kiterudoleluge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e53b69cd-b3e6-4219-bb08-0c3e696fc877/generac_3100_psi_pressure_washer_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a352bf62-5d9f-4d71-9dff-bdee17e3c058/gta_5_3dm_crack_and_update_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/bhojpuri_dj_song_video_gana_ing.pdfIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_4e5c468ee69343deb5419e2eaea92e1a.pdf?index=trueIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_d5e35ea05f6149f589467cf69622a1b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca9c3157-8c38-46d0-97d5-08c30ba7180a/nobapoxokesazapanewime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68190cb8-643e-4d6a-b339-d76ca6337bf0/pugenobonufeluw.pdfIn PDF document text
    • https://86860ce8-2957-478e-97c3-2abddc2d2c3c.filesusr.com/ugd/754ed1_d3cb5b1d41f449c3816eeb2d7677477a.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_f57dfe1ffb5041169b88929ab100ecf6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/pioneer_mvh-s21bt_reset.pdfIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_59d65c313500439f8281cf36b3f94596.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 45872 bytes
SHA-256: 1a7f1c382daf04e1e038c36960564305c6ade451500131bae198853e5f92c4fb
font_01_sfnt_off00018594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18594 5396 bytes
SHA-256: fd92c3971a4a6fb10b9e9e2b2caa8488d4191846c8822479fcd83bfa7295691b
font_02_sfnt_off000197c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197C5 11140 bytes
SHA-256: 8876d1f55743d2eda3e430420b51c2093e78d6bc42de4b3798f62c2aeeeb22cb

Open this report in the interactive analyzer, or submit your own file for analysis.