Malicious PDF — malware analysis report

Static analysis result for SHA-256 798ece39efdb5391…

MALICIOUS

PDF

82.4 KB Created: 2021-03-24 11:15:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 41b13fbe67d81145748d357dedec23ef SHA-1: 479ae2822b739d80c953d2ed8a50918990ca2be1 SHA-256: 798ece39efdb539151205278ab7160ccb3049cfe17ab4e53750838670c6691cd
126 Risk Score

Malware Insights

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

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 0.9990

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://jacksth.ru/123?utm_term=vip+betting+tips+predictions+apk PDF link annotation
    • http://zowedikeseku.iblogger.org/gusonexomave.pdfIn PDF document text
    • http://tomandbxof.site/50911322241lfpci.pdfIn PDF document text
    • https://tokarakuwo.weebly.com/uploads/1/3/0/9/130969339/1307715.pdfIn PDF document text
    • https://fototinuvanumef.weebly.com/uploads/1/3/1/4/131406749/xaxuzuwironifolobi.pdfIn PDF document text
    • http://lusoxokurutugap.22web.org/70037450243.pdfIn PDF document text
    • http://shoop-fg.ru/mozilla_firefox_for_linuxsmbki.pdfIn PDF document text
    • http://narezekopalezi.iblogger.org/ap_bio_exam_2013_free_response_answers.pdfIn PDF document text
    • https://faxojoduso.weebly.com/uploads/1/3/5/3/135351685/jugizubivowu-dosiz-gokapixuf-bufedob.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/32507200694vslwt.pdfIn PDF document text
    • http://reduslimitaly-official.website/vimejaweragiwolabofewulo5ehs4.pdfIn PDF document text
    • http://businessmentality.com/hobby_lobby_classes_appleton_wi9p9nr.pdfIn PDF document text
    • http://citruss.space/adobe_reader_annotate_filesn1ehf.pdfIn PDF document text
    • http://lazadacostumercenter.com/zagiluremilubm63sj.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
    • https://uploads.strikinglycdn.com/files/1a76a04b-3b3c-48cd-b915-f2bf6a4c5313/how_to_get_filthy_rich_in_rising_asia_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0da8ed26-0e46-46e4-b720-cb8be22d8991/53902485960.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/rolanozorogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d58975d-fbe8-4079-b6ba-ef0457377582/peter_atkins_physical_chemistry_11th_edition_solutions_manual.pdfIn PDF document text
    • http://figaniver.epizy.com/60106637364.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/metaphors_in_romeo_and_juliet_act_3_scene_3.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/84796278673.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/happy_birthday_indian_songs_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63e62e98-1a2c-4f9c-b895-f77a5f6dca5b/raypak_rp2100_heater_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/clipart_apron_template.pdfIn PDF document text
    • http://levaduru.epizy.com/kurixudopog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17041eec-a9ca-4f15-97a2-ff401d1dd0e6/how_much_does_it_cost_to_rebuild_a_4.3_mercruiser.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_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 5164 bytes
SHA-256: 0df28b957416146facee9ddf0ab007e443bda2757c0ccd92c4c34d9b304d9bca
font_01_sfnt_off000108b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B7 10816 bytes
SHA-256: 3e7eef092bd2118e4721af6169cae6863de503b201b0b7c07bf6e4188a4ec790
font_02_sfnt_off00012ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDB 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2