Malicious PDF — malware analysis report

Static analysis result for SHA-256 255c335947c3ca72…

MALICIOUS

PDF

85.0 KB Created: 2021-04-07 05:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7766e37ca436ff90eea10a3af612afcf SHA-1: d242e5b7ddfcee6cebda072cf163dcbb82591ace SHA-256: 255c335947c3ca72d53b55000ea63fe14c5850967f3341be030c4d873180e47e
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with a high risk score. It contains an external URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a 'lab report' lure, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/123?utm_term=lab+report+grignard+reaction
    • http://nickned.me/7812512362zp00e.pdf
    • https://cdn-cms.f-static.net/uploads/4417137/normal_6066d763b9f88.pdf
    • http://uorott.com/igt_haywire_slot_machine_for_salerrjqu.pdf
    • http://marinarus.space/boxowevudedotuzop9yo4g.pdf
    • http://tulavesew.getenjoyment.net/mumogusamuxanaxujof.pdf
    • https://static.s123-cdn-static.com/uploads/4468871/normal_5fc8be92e3c86.pdf
    • http://ramuwesitavoz.mywebcommunity.org/bejup.pdf
    • http://fuvesozufinefi.medianewsonline.com/public_finance_book_by_lekhi.pdf
    • https://cdn-cms.f-static.net/uploads/4387921/normal_5fd31e2069a6b.pdf
    • https://cdn.sqhk.co/tipefimex/izhaieP/pasujisebavepa.pdf
    • https://cdn.sqhk.co/dokiladigana/d6Dhggc/lagu_albi_nadak_lirik.pdf
    • http://tulomodev.getenjoyment.net/51430343514.pdf
    • http://virulakud.iblogger.org/boucher_textbook_of_prosthodontics.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sokiguxesixup.epizy.com/danorapufisinisezedabo.pdf
    • https://uploads.strikinglycdn.com/files/9773f3e2-41ba-44c7-a44e-1ad15389bc72/30852389908.pdf
    • https://uploads.strikinglycdn.com/files/4f0f9f1d-b6bc-43cf-b172-07fed2fc7c4f/lewins_genes_xii_ebook.pdf
    • http://xoruxagejot.rf.gd/cgst_bare_act_2020.pdf
    • http://diwukimip.epizy.com/how_to_reset_avr_151.pdf
    • http://dojukedak.epizy.com/jiwonugibategizejo.pdf
    • https://uploads.strikinglycdn.com/files/03091958-29c1-4fde-a688-f2d016cfefc1/58558195128.pdf
    • https://uploads.strikinglycdn.com/files/856dd77b-573a-4d9b-952a-c7d7d31f6c2f/if_cell_contains_text_then_change_color.pdf
    • https://uploads.strikinglycdn.com/files/21567e7c-0962-43e2-b51e-492b11088376/why_does_my_refrigerator_leak_water_on_the_floor.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa88.bin
c17b200bc12d70f3933a141e0bca099dbbc193dc3d2909f0c9679125a7dea28f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA88 5112 bytes
font_01_sfnt_off00010bf9.bin
86f5f7f8969faa3626c337827735b960d88e815dc17401fad7e1cce787fbf9e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 10936 bytes
font_02_sfnt_off00013181.bin
e062faff0b5f3d12ef96d17a813e209689a07cec8984531399442ab350abe39b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13181 16136 bytes

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