Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa21c18554316f71…

MALICIOUS

PDF

159.2 KB Created: 2021-05-14 04:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e5f99b9593fb8ebf7dc0ac9f66139afd SHA-1: 567ec9e24d1f0517f8391ab49e554d59499145fc SHA-256: aa21c18554316f715d8be2336c885819948aa3f6a1eef7454e544afc9f91fc3d
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary lure appears to be offering a free download of VMware Workstation, which is a common tactic to entice users to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9814

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/strik?utm_term=vmware+workstation+free+download+for+windows+server+2012+r2 PDF link annotation
    • http://onkoprofi.ru/wenutadijetve8z.pdfIn PDF document text
    • http://tiktokfrance.fun/432251129719pcl8.pdfIn PDF document text
    • http://nubolats.xyz/mikajemoruvomelujqitvc.pdfIn PDF document text
    • https://gebomatera.weebly.com/uploads/1/3/5/3/135396668/kijofobedesod_rusugevimerifag.pdfIn PDF document text
    • https://cdn.sqhk.co/dorusafe/yVjeidG/66966385845.pdfIn PDF document text
    • https://kunepupavebi.weebly.com/uploads/1/3/4/0/134095879/fenifixolevares.pdfIn PDF document text
    • http://nelefir.22web.org/como_aprender_ingles_sozinho_em.pdfIn PDF document text
    • https://jefiwoso.weebly.com/uploads/1/3/5/9/135996081/jawoginosu.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/hhiJUji/xapedor.pdfIn PDF document text
    • https://cdn.sqhk.co/kinubowa/jrby7gj/hockey_card_collection_binder.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/jivat.pdfIn PDF document text
    • https://tugofemupufere.weebly.com/uploads/1/3/4/5/134584107/733392.pdfIn PDF document text
    • http://pedaropira.22web.org/vigejawagumumu.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/7jbkMja/81661070759.pdfIn PDF document text
    • http://meetdouche.xyz/how_to_clean_danby_premiere_air_conditionerpni27.pdfIn PDF document text
    • https://cdn.sqhk.co/zobunifi/hjehjez/44794542691.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/58950496800.pdfIn PDF document text
    • http://muporomeg.rf.gd/purixakum.pdfIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_99161a6ade7b456798a104b13dfebb8e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gitipelut/the_banner_saga_apk_full.pdfIn PDF document text
    • http://litiwevapebani.epizy.com/belkin_n150_wireless_router_reset_password.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/was_it_a_dream_commonlit_answers.pdfIn PDF document text
    • http://maferodo.epizy.com/sulagepo.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_bee241fd03ae4ba2ac9ab6edd4ae2947.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/15554270532.pdfIn PDF document text
    • https://e714dd98-3e42-4604-aba1-6d4b2506b1a8.filesusr.com/ugd/742965_42b1bd747d724b8b9da2aae91ecab523.pdf?index=trueIn PDF document text
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_8146646a60d34a5badf5cae18a3e5a30.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gekojulog/power_pressure_cooker_xl_rice_and_beans.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF82 5560 bytes
SHA-256: ef0a77c1ae5f31ebf51b53a94032c1501cafbfbec4ac5501a2d0dc84d92e95fd
font_01_sfnt_off0002126c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2126C 6068 bytes
SHA-256: d8e4b7f44dfb66ea49c7f1cefd345a391fade3fb548cc17de4cdbf151663dabd
font_02_sfnt_off0002221d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2221D 20732 bytes
SHA-256: f07234cea4eb69d2734c7b1d03124b8d2b8bb21513e1b4ffb448425209658b3d
font_03_sfnt_off00025694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25694 16072 bytes
SHA-256: ddedb84bd1e8a54b9f54678af270270befc79532f6c6f54dc4a61cbb1f9bc02a

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