Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd859130d5df4d7…

MALICIOUS

PDF

72.5 KB Created: 2021-03-26 16:53:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de26dac3cdaa35dc2a357f1ea289e57d SHA-1: 193ec0eaefe27c196b3dc2418cdc6329db048966 SHA-256: 5bd859130d5df4d7096b4829071a5d5e5469995acce52365d9f0739b61b35162
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that leads to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The document body, though truncated and obfuscated, suggests a lure related to academic content, likely to trick the user into visiting the malicious URL. The presence of an external URI and the ML classifier's high confidence further support a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=bilinear+transformation+in+complex+analysis+examples
    • https://cdn.sqhk.co/gixezovof/gpruEhb/fameliwamovagiwegis.pdf
    • http://begdas.space/wukoropukenibijajil7ts.pdf
    • https://cdn.sqhk.co/wekaradukuve/6gf2Dmi/dubibilojani.pdf
    • http://namafafiteg.mypressonline.com/bloqueo_auriculoventricular_electrocardiograma.pdf
    • https://cdn.sqhk.co/vefapatape/ii4mggB/21124418668.pdf
    • http://hurleyshamburgers.com/lambo_urus_top_speedao9l6.pdf
    • http://tibijosetinaj.getenjoyment.net/ielts_academic_reading_practice_2020.pdf
    • https://cdn.sqhk.co/gabisolovima/jP9L1gi/flashlight_song_pitch_perfect.pdf
    • http://zodelem.mygamesonline.org/zuzurovi.pdf
    • http://nugowimabu.mywebcommunity.org/fowavufagezufakabaluka.pdf
    • http://faxusigeroles.sportsontheweb.net/kenuzato.pdf
    • http://sozimaxetupow.mywebcommunity.org/catia_documentation.pdf
    • http://puvinizozibejir.mygamesonline.org/auckland_university_application_form.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_d7a303ce13e2469b86d282bf128223f5.pdf?index=true
    • https://e3fa7c29-d2c9-486a-b5ab-5f31a997b381.filesusr.com/ugd/c4dbd3_c2426b64a79d4f348ee582bc125ac594.pdf?index=true
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_d131ef8a34de4836b0d110623546332c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8178df88-70f0-4fb2-ad0f-0b07f7e39ee5/kjv_1611_facsimile.pdf
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_0e73bc5db20f428180cf6b81fc554e4a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/911c73af-75d7-4b5e-bbc2-de476c4b4274/the_startup_owners_manual_steve_blank_free_download.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_off0000dd33.bin
76b64cc28c88e00e6d952191023aba0a46de3ddd8e50e6cd7373283a3bd98c92
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 5380 bytes
font_01_sfnt_off0000ef7a.bin
d999093799d6a2f47f12edae2ca798a56c6e6a57248eb5a6ff83246f399da1df
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 11088 bytes