Malicious PDF — malware analysis report

Static analysis result for SHA-256 2391f78fbc713b91…

MALICIOUS

PDF

81.4 KB Created: 2021-04-10 12:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40c4aeddbfa9ea8f3fa09a3f7b7410a7 SHA-1: e8b67787322c6fe5951481f3fb2a80d6e9450518 SHA-256: 2391f78fbc713b913e1aaf463b396073e428ab22679c8e32a3095b41b1710512
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/strik?utm_term=convict+conditioning+workout+routine
    • http://visetazide.medianewsonline.com/17762024968.pdf
    • http://kamikofonem.mygamesonline.org/spelljammer_ships_5e.pdf
    • https://womogidukiwu.weebly.com/uploads/1/3/4/8/134873304/jibise.pdf
    • https://mozijazese.weebly.com/uploads/1/3/4/4/134460989/7538909.pdf
    • https://zadavutuni.weebly.com/uploads/1/3/4/3/134343582/5380990.pdf
    • http://robinmani.site/neredniun9.pdf
    • http://salleapp.xyz/ac_joint_tear_exercises5c38h.pdf
    • http://fito4ka.xyz/bootstrap_4_form_checkbox_alignment0p0st.pdf
    • http://bilkan.fun/javesukxrtl.pdf
    • http://shoop-fk.ru/800660867401iyrp.pdf
    • https://narepugajud.weebly.com/uploads/1/3/0/7/130775299/7277122.pdf
    • http://xitawefavam.medianewsonline.com/40181587129.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/9540aec8-bd60-4f28-b125-d6440c56c238/53681250774.pdf
    • http://siwodonodefofo.epizy.com/christmas_sheet_cake_pictures.pdf
    • https://s3.amazonaws.com/kumasala/curriculum_guide_2016_grade_4.pdf
    • https://uploads.strikinglycdn.com/files/9d02627f-4336-4315-b6d3-1d7afc625007/machine_learning_coursera_free_download.pdf
    • http://jisuxojaj.epizy.com/up_pgt_sociology_syllabus_2020.pdf
    • https://s3.amazonaws.com/vufupu/6442361429.pdf
    • https://s3.amazonaws.com/fulazelof/lagu_ari_lasso_arti_cinta_gratis.pdf
    • http://zudupaxub.myartsonline.com/is_there_a_bible_written_in_chronological_order.pdf
    • http://pikaderobiw.atwebpages.com/how_to_find_lattice_energy_of_a_ionic_compound.pdf
    • https://uploads.strikinglycdn.com/files/fd87727b-9a74-4798-9624-7c4d4b76095d/how_to_find_the_area_of_a_triangular_prism_net.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f400.bin
5fd05d0b6d66ea436fd038cb68b69a5a611b1ddf1f6de9d1486336ec57c2cf15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 4808 bytes
font_01_sfnt_off0001047d.bin
efa865b8dba453c6565528b583e30aa36dadae26bc0c4c055f7e7b2502970d1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 10908 bytes
font_02_sfnt_off000129a0.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129A0 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.