Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb864ced1481ef8…

MALICIOUS

PDF

72.6 KB Created: 2021-04-24 21:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ffbfbbab2a1e0669b2407765fbde5b58 SHA-1: 707fdfc4585b1602577c037d78b303699b5f1ac1 SHA-256: 4eb864ced1481ef8c96a599d0962dec999c9f87c86f6b46264224a04fc38c189
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9995

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.
  • 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://nipisod.ru/strik?utm_term=doctor+zhivago+movie+rating PDF link annotation
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/8138012.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/jbEbmxO/ouroboros_arm_tattoo_meaning.pdfIn PDF document text
    • http://rozel.ru/constitutional_and_political_history_of_the_united_stateswer14.pdfIn PDF document text
    • https://cdn.sqhk.co/bizewavaxug/j4OmYIj/how_to_read_battery_report_windows_8.pdfIn PDF document text
    • https://goxapuvuf.weebly.com/uploads/1/3/2/7/132741714/nisidom_dolubad_sewurawuf_nimovobani.pdfIn PDF document text
    • http://rp-youtube.fun/6260187096jhcc2.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/bjc13jg/7653654637.pdfIn PDF document text
    • https://cdn.sqhk.co/tudusiki/gc2VuPX/bet_shows_list_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/senaveduwiz/fijhiqU/9977316343.pdfIn PDF document text
    • http://allieshouseofhope.com/mp_board_duplicate_marksheet_applicationzjros.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/how_much_transmission_fluid_in_2004_honda_odysseytd964.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/that_would_be_great_meaning_in_tamilq5vj2.pdfIn PDF document text
    • http://mihetos.xyz/how_much_is_construct_33b93x.pdfIn PDF document text
    • http://static-get.top/zovupupowomasepisowijilufgi1u.pdfIn PDF document text
    • http://13millions.store/kadamban_video_song_hdj8xqz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_adced55a1c3240e193174675a1c2cec0.pdf?index=trueIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_2ad3c4a72dd24ed482b0ac93d8fc9424.pdf?index=trueIn PDF document text
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_ac59c35285834c1d8a643713d832a822.pdf?index=trueIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_30706a81bcc940c6960fce197606dad2.pdf?index=trueIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_80aa9b4bd1e14bc2981a587e343bd5ae.pdf?index=trueIn PDF document text
    • https://b3159766-6c8b-4733-a97d-e59ef6783693.filesusr.com/ugd/21851e_146c2ff5e2b848b988203a767a251d23.pdf?index=trueIn 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_off0000ce31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE31 3348 bytes
SHA-256: 134d19b7519ad60e285039a34a138ae61a44140df32376e879cc4654a04bfe24
font_01_sfnt_off0000da46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA46 5112 bytes
SHA-256: f89ef28319afbccb6809afa65a3fc093d915d98ebf83181d7ce3ff618fdfa79a
font_02_sfnt_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 11944 bytes
SHA-256: 3a0d7ad382df602f0b8fd26ff7868708ac52da19631ab830859c525a7dd280f6