Malicious PDF — malware analysis report

Static analysis result for SHA-256 6322eb50a0ac06f7…

MALICIOUS

PDF

74.8 KB Created: 2021-03-21 21:47:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f002ebacb71ca87a4d5d5bd17707cd21 SHA-1: 72b4d9951ae170ab8aac2815c3b8a017b549862e SHA-256: 6322eb50a0ac06f77313773cc8a802de9fe68162d57a7755f68b3d5c00ef4988
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://soxebez.ru/aws?utm_term=the+last+leaf+extra+questions+and+answers+pdf
    • https://cdn.sqhk.co/lirebirab/f7eicyQ/37168455351.pdf
    • http://nuwojukow.mygamesonline.org/sustainable_building_design_manual_teri.pdf
    • https://cdn.sqhk.co/toneribabut/rX3Nhi4/hssc_clerk_answer_key_22_sep_evening.pdf
    • http://lebedugipul.mywebcommunity.org/cell_cycle_checkpoints_and_regulation.pdf
    • http://sixesijilolun.mywebcommunity.org/9525716530.pdf
    • https://static.s123-cdn-static.com/uploads/4424996/normal_5fcd525a77392.pdf
    • https://cdn.sqhk.co/zijigemeworu/c5A8Gjd/reversible_sherpa_jacket_sanctuary.pdf
    • https://cdn-cms.f-static.net/uploads/4383573/normal_6019ff835c13d.pdf
    • http://bulibujirifubof.scienceontheweb.net/apprendre_le_russe_lecon_1.pdf
    • https://pazumufavizup.weebly.com/uploads/1/3/4/5/134506393/jawudusel.pdf
    • https://pizazolumugi.weebly.com/uploads/1/3/4/0/134016987/6015571.pdf
    • https://cdn.sqhk.co/xonaruvipiti/hGjgEhg/57491312800.pdf
    • https://cdn.sqhk.co/ruvatagukas/hhdjhLs/civilopedia_6_francais.pdf
    • http://bizifemodefi.mygamesonline.org/jiwujelabawanizudegoname.pdf
    • https://cdn-cms.f-static.net/uploads/4421207/normal_60534af7ccf1c.pdf
    • https://cdn.sqhk.co/kixagixupo/jhejibZ/umc_zorgverzekering_valt_onder.pdf
    • https://bibuzutevokad.weebly.com/uploads/1/3/4/6/134634257/degefekujexasagunoz.pdf
    • https://cdn.sqhk.co/letarezetap/CsaOhdD/77800013952.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vujuvisesakok.myartsonline.com/guitar_grimoire_exercise_book.pdf
    • http://vibirokudod.myartsonline.com/seek_and_destroy_bass_tab.pdf
    • http://dozopedatofol.atwebpages.com/descargar_biblia_reina_valera_1960_para_android.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_off0000e56f.bin
0bcb96a760309550bd733bced895c73f9cd19a166d5667da7592964c8105674d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 5364 bytes
font_01_sfnt_off0000f7be.bin
abdb7388db231b09382a9a03cea9c9cc1322320c650886a1ab7f37187494498f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 10728 bytes

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