Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e980afdc2383fd4…

MALICIOUS

PDF

78.2 KB Created: 2021-03-22 07:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6791c0637778b99c4da95154c9e20e1b SHA-1: 78574c7c750ff62c5b97a9b44af6f7e6f476a144 SHA-256: 1e980afdc2383fd4c52cac846235185a3426f7abc28650804875e0dc753b8557
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated or use SEO-like keywords, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious or spam content, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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.
  • 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/wix?keyword=aroma+professional+rice+cooker+instruction+manual
    • http://warixedivukinat.mygamesonline.org/10606402393.pdf
    • https://fupigipefixoxom.weebly.com/uploads/1/3/1/3/131379213/zefexitebik_gamuxefifebu_molivusirinotuz.pdf
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/b7576.pdf
    • https://roromitekavu.weebly.com/uploads/1/3/4/5/134528712/vafadowuwusuxofifaje.pdf
    • https://cdn.sqhk.co/muvotugi/fhdjagc/dafosuzu.pdf
    • https://cdn.sqhk.co/vutabopi/9khhhdm/sound_physicians_emergency_medicine_of_kansas_llc.pdf
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/kudikivukedefex.pdf
    • http://moxilekulina.getenjoyment.net/mufivi.pdf
    • http://baxagaxisatipa.22web.org/55713031180.pdf
    • https://cdn.sqhk.co/nupozifulija/W6hbljg/17316293377.pdf
    • http://ketuzel.22web.org/pumufemusixisujemenu.pdf
    • https://cdn.sqhk.co/jigijobofofa/Vhcgjgi/32156538563.pdf
    • https://cdn.sqhk.co/dofewijoras/hbxOFcY/geluforibigekofedoteva.pdf
    • https://cdn.sqhk.co/dokederajo/OFia3SK/30217434601.pdf
    • https://cdn.sqhk.co/vumusokutil/ZJjgjgg/carson_city_dmv_title_department.pdf
    • https://dorizusedi.weebly.com/uploads/1/3/0/7/130776489/wejubojol_lopunidojeze.pdf
    • http://botanilix.mygamesonline.org/botany_textbook_class_11.pdf
    • https://cdn.sqhk.co/pazakazagoz/h6hfgjd/build_a_truck_by_duck_duck_moose.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jogilajixetevub.rf.gd/que_se_entiende_por_derechos_humanos.pdf
    • http://keporumutiwem.epizy.com/cancer_de_prstata_2020.pdf
    • http://depubewe.epizy.com/south_africa_national_anthem.pdf
    • http://nawopezor.rf.gd/karimnagar_district_weather_report.pdf
    • http://sopikakerozobud.epizy.com/chemical_reactions_balancing_equations_worksheet_2.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_off0000f3f3.bin
b7b9b40585dbe2e9893b30bf5c80c01e639b9cbec0cf545dfc239d9a4c17c2a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 5212 bytes
font_01_sfnt_off00010597.bin
53ea32bd1b835a0506cf90120fd5f20743e12a842b95db17aa8416d169ba971f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10597 11104 bytes

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