Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4042a9c0d8365eb…

MALICIOUS

PDF

80.1 KB Created: 2021-05-08 00:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6596a62075885bc26360da8c7907610 SHA-1: 7a5e1b50a6bb8ee7c78ed058466e16ee9c5e914e SHA-256: a4042a9c0d8365eb625bce49211cd4c3dd0c312446c9bbe2baa1144ba0505d4f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The PDF contains a large number of external links, suggesting a link farm or phishing attempt. One of the primary URLs identified is `https://dafemum.ru/strik?utm_term=char+broil+performance+440s+4+burner+gas+bbq+review`, which is likely used to redirect users to malicious content. No scripts were extracted, but the PDF structure and link farm heuristic strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=char+broil+performance+440s+4+burner+gas+bbq+review
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/tumatavugujaxubimexi.pdf
    • https://cdn.sqhk.co/jabosuve/3gigjjb/biggest_slither._io_snake_world_record.pdf
    • http://vnatural.space/nominal_ordinal_interval_ratio9v7gp.pdf
    • http://gixepabu.22web.org/conjunctive_adverbs_list_and_examples.pdf
    • https://xuvuvigaxopezut.weebly.com/uploads/1/3/4/7/134721928/f90dd9d2f7600.pdf
    • http://storeyou.store/wafanuseragubuyhrcr.pdf
    • https://cdn.sqhk.co/suxavawudomo/jiJTifn/x_wing_star_wars_game.pdf
    • http://lg-copyright.com/receita_de_salada_de_frutas_simples_com_suco_de_laranjaj5nxv.pdf
    • http://smartcoin.design/luxpro_thermostat_wiring_diagrama12nf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_2f50adc82aa1466faeddf84dfd77b7c9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/be53219a-e709-4035-999e-f4f8a0edc293/a_discovery_of_witches_season_3_episode_10.pdf
    • https://uploads.strikinglycdn.com/files/7bc65583-64cf-4c20-9d43-1ab0462819fd/canterville_ghost_movies.pdf
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_53b56d34b71b4f659b65b3ade95a8dd1.pdf?index=true
    • https://dd3a609d-fcd9-461e-ae06-f7e9ec6f332d.filesusr.com/ugd/811c3f_3fe3ad70be514f018f51bbfc9cd731c8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a2af4eba-c680-4e66-97d0-98ad94cd6f20/digi_003_mac_drivers.pdf
    • http://gipipirerogarul.rf.gd/91310981622.pdf
    • https://uploads.strikinglycdn.com/files/5c5b9392-88cd-42ab-a849-73b3816e19ee/how_to_read_velocity_chart_in_jira.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_off0000e46e.bin
3f46528b6928e583f95a1d9c47644b67ffa9d729378dcb7c730eee898793dff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE46E 5980 bytes
font_01_sfnt_off0000f8b2.bin
e422903420c899b9e80ebdd51a89944c1a3d77375f5f395887371773400f6e03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 10748 bytes
font_02_sfnt_off00011d8c.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 16204 bytes

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