Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7a63c6f5c597b5…

MALICIOUS

PDF

94.6 KB Created: 2021-05-22 20:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 648e1d5e22982ea5a15929ccf0f3e94a SHA-1: 90994baf0f62e973ab0c568dcaf41350133db42e SHA-256: 7d7a63c6f5c597b5f3c8abc8e8b997af027bc925c13061452adaa5c15b7e8105
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 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://nipisod.ru/strik?utm_term=pl+deshpande+books+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402745/normal_600bf0b0bba02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501208/normal_5fcf8c4056bd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403421/normal_6046e3db4f693.pdfIn PDF document text
    • https://devatokur.weebly.com/uploads/1/3/2/6/132683056/d27dfa4.pdfIn PDF document text
    • https://novomuzedideb.weebly.com/uploads/1/3/1/4/131406537/7321787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481417/normal_5fdb62574da54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ddf820-e07d-4b9e-b937-9fc8026fdd41/standard_wire_haired_dachshund_breeders_bc.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/xovufajijupulig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9e28d8-1da5-4ba0-b5b3-5b8bb0da3b8a/ejercicios_de_estadistica_resueltos_tabla_de_frecuencias_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a3a168d-a193-4f47-8413-954e66afd79b/winters_bone_watch_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/ccna_1_practice_final_exam_answers_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce14c7b0-d45a-48e7-9fc1-6ccd79808251/brandy_norwood_songs_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/what_channel_is_fox_on_directv_now.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/how_to_set_time_on_nortel_t7316e_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d546ed3-8be3-4e67-9dd2-a7d88fb71fff/nojom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfeeab55-df26-4b50-8612-56956759b39e/limonuvaxigetinusap.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/katoxajinuxikenamiteketiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b143448-6d2b-4977-8cf5-5a8890e9a7b8/how_to_read_dog_man_books_online_for_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/tamil_nadu_railway_station_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/ender_in_exile_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9af2b0c1-3c12-42e4-92d8-a763d8285599/16285427040.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/vampire_diaries_season_1_episode_17_watch_online_free.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 5084 bytes
SHA-256: 7353680889bf8aef452f0b8d997e086fe5ee577ff528dff14e8c896ab9553613
font_01_sfnt_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 10948 bytes
SHA-256: fbb9dcaa79ec96e39871b5143b63f43baf203a80f74b8e07a98a0655632acae7
font_02_sfnt_off00012bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD8 16168 bytes
SHA-256: bcfecb9fde4b74e4a2b692e15caf305b2988a1cfe4c6386614002e38d35feb86
font_03_sfnt_off000140de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
font_04_sfnt_off00014ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDE 7940 bytes
SHA-256: 15dc0d3d14d1c417b8f67969f7206dc13690ffeb1eeb05dea8f5bfe8c292a61b