Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d24bbc6c8ff8df…

MALICIOUS

PDF

79.2 KB Created: 2021-03-15 06:44:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfe7d7c940901dfdbe29d900c1f18c2f SHA-1: e0d03e80e5392944fb3d14450522d26077cc0e7f SHA-256: e5d24bbc6c8ff8df3a174f8f010d125320e2b13e09d49e812321671db2a702c0
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one identified as a malicious redirector. The document body, though corrupted, suggests a lure related to downloading a study guide, aligning with phishing or malware distribution tactics. The presence of a malicious redirector link and the high ML score indicate a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/wix?keyword=saunders+nclex+rn+6th+edition+pdf+free+download
    • https://cdn-cms.f-static.net/uploads/4417805/normal_602cfa02c3a58.pdf
    • https://static.s123-cdn-static.com/uploads/4428043/normal_5ffe06af4803a.pdf
    • https://jesofoxera.weebly.com/uploads/1/3/1/4/131407857/lewejuxawaxol.pdf
    • https://sigoberedida.weebly.com/uploads/1/3/4/5/134594083/bbd577a0d2.pdf
    • https://static.s123-cdn-static.com/uploads/4454691/normal_6000154705b64.pdf
    • http://suvoramitasowiv.22web.org/netgear_n600_wifi_range_extender_wn2500rpv2.pdf
    • https://static.s123-cdn-static.com/uploads/4419642/normal_5fc7996e22f42.pdf
    • https://cdn-cms.f-static.net/uploads/4478961/normal_601e77c98c401.pdf
    • https://cdn-cms.f-static.net/uploads/4387581/normal_603581528ac65.pdf
    • http://morikulifitoj.22web.org/psd_file_tri_fold_brochure_template.pdf
    • https://static.s123-cdn-static.com/uploads/4368956/normal_5fc6898fa4c22.pdf
    • https://cdn-cms.f-static.net/uploads/4369779/normal_6023ba1f1f78a.pdf
    • http://nebefajibavake.22web.org/sifamod.pdf
    • https://static.s123-cdn-static.com/uploads/4367275/normal_5fded83d21d0b.pdf
    • https://static.s123-cdn-static.com/uploads/4375517/normal_5fcdb09e60ff7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ba7bae0e-6b38-4ccb-95b4-27b42398c7af/our_last_night_forgotten_souls.pdf
    • http://menivafanar.epizy.com/best_bass_booster_app_for_android_2018.pdf
    • http://daxotumolurotaw.rf.gd/all_video_er_app_free.pdf
    • http://merizipu.rf.gd/drinking_meme_template.pdf
    • http://xawavejemefo.epizy.com/xaxuwewevivunuxanuropet.pdf
    • https://uploads.strikinglycdn.com/files/fe49f245-ca35-4d72-8616-45783db30b52/1st_20_cube_numbers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4fe.bin
149675594b213a0af45918be2cd1ad6a7e03541d26530df82ce164380311e882		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 5660 bytes
font_01_sfnt_off00010850.bin
325738815a6f90eb4297f43063923606863ad3dfb3e8f6e7b768c76e99cf32a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10850 11576 bytes

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