Malicious PDF — malware analysis report

Static analysis result for SHA-256 88794255fdd0c73c…

MALICIOUS

PDF

80.4 KB Created: 2021-03-17 00:39:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 76c06f3ff37d5465335b9075a04ada3f SHA-1: b7da06fb049fe4b67ed9a4f76473386de62ac9f5 SHA-256: 88794255fdd0c73c35247f74f07c201a244a77e3e78f42894662c31edd8b29c1
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Antivirus Software Disabled

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a security-bypass lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/wix?keyword=stranded+deep+apk+download+pc PDF link annotation
    • http://wegoluxetas.scienceontheweb.net/ledaluvafajo.pdfIn PDF document text
    • http://sizoxuk.22web.org/badrinath_movie_video_song_hd.pdfIn PDF document text
    • http://puduzex.22web.org/bloch_theorem_derivation.pdfIn PDF document text
    • http://jerunurijo.iblogger.org/tuxomudomovuzafux.pdfIn PDF document text
    • http://risumeboze.getenjoyment.net/33701905346.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/pokajisozul.pdfIn PDF document text
    • http://rilizikurejoru.22web.org/97526771476.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nonixita.rf.gd/cours_anglais_bac_lettre.pdfIn PDF document text
    • http://midizigikeg.epizy.com/how_to_remove_architect.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b93aa38a-ea84-4acc-b37d-53ffdd176a35/samsung_smart_tv_audio_out_external_speakers.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/air_force_airman_dress_uniform.pdfIn PDF document text
    • http://tiwufuwivuvuf.epizy.com/sesavefe.pdfIn PDF document text
    • http://mepulufe.epizy.com/local_area_network_lan_topology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a8c75a-4d92-4d61-88a7-9fba95ea7140/how_much_does_a_christmas_tree_cost_uk.pdfIn PDF document text
    • http://patazave.epizy.com/what_does_spindle_apparatus_mean_in_biology.pdfIn PDF document text
    • http://juwebud.epizy.com/82958750421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71cfa146-b86b-4e10-baa8-4eb6dd0a6701/cant_wont_dont_stop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56ae8483-82ed-402d-a8f2-31844b316a30/jijexufo.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/buku_filsafat_humanisme.pdfIn PDF document text
    • http://xologikaju.atwebpages.com/the_american_journey_a_history_of_the_united_states_textbook_online.pdfIn PDF document text
    • http://zenoridofagokev.epizy.com/american_gods_book_chronology.pdfIn PDF document text
    • http://jenofabejuvokag.epizy.com/avneet_kaur_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e75c3cdb-43f0-4895-ae7b-8bc19761b377/98212297907.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/tajuzagezupoxulijevu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 5148 bytes
SHA-256: a6dec351aa43cb0798f8d56ee73a3fb14e61629bed7b23f8159fdbbb42a7cef2
font_01_sfnt_off000104d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00010d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D62 10864 bytes
SHA-256: 80000042a3274533ae8ccfff909116661fa0e1ae26a37f19e72dfe0f29854fa6