Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b03b94589586f7…

MALICIOUS

PDF

77.1 KB Created: 2021-03-04 07:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6b686d132d39653ee5e39792cc27d61c SHA-1: 29d373da48ae723641f1a8dfbaec871f760ad15c SHA-256: 79b03b94589586f7d082fb665300b01b6746186081028145061a6ff3bdf6e6ef
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 0.9998

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://dafemum.ru/123?utm_term=honda+civic+2006+ex+o+lx PDF link annotation
    • https://bosamekuxukis.weebly.com/uploads/1/3/4/6/134672370/e870341b79f.pdfIn PDF document text
    • https://vumenaxusavow.weebly.com/uploads/1/3/4/6/134600171/bc6538021a.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/g8ieijG/bewegata.pdfIn PDF document text
    • https://pozusope.weebly.com/uploads/1/3/1/4/131453674/napuxo_denanozovajana_pisebimobidefur_juzipuzidez.pdfIn PDF document text
    • https://vojizozovogimum.weebly.com/uploads/1/3/0/7/130740342/kosuzaxizulugu_maxulomoze_fosusufapeto_fimulug.pdfIn PDF document text
    • http://comforfemj.fun/chrome_for_pc_32_bit_2018u53uk.pdfIn PDF document text
    • http://fbcopyright-center.com/best_stock_broker_in_india_for_long_term_investmentn7spz.pdfIn PDF document text
    • http://moneyindia.site/natapagagozutufilumo7uvlf.pdfIn PDF document text
    • http://eeeeeyyy.space/meme_soundboard_and_vine_2020_cleang5r98.pdfIn PDF document text
    • http://profapp.pro/how_to_get_a_girlfriend_online_quorah6ta1.pdfIn PDF document text
    • https://lanujedajifita.weebly.com/uploads/1/3/1/3/131382078/7987430.pdfIn PDF document text
    • http://besuxiju.22web.org/67051672171.pdfIn PDF document text
    • http://sobanurosu.22web.org/probability_determining_probabilities_using_area_models_answers.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/46524196256c60z9.pdfIn PDF document text
    • http://copyrightprivacy.site/how_are_marine_organisms_classifiediddjc.pdfIn PDF document text
    • http://fuvagezilavez.mygamesonline.org/metodologia_de_la_investigacion_juridica_gabriel_alvarez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bememikat.onlinewebshop.net/how_to_use_jvc_camcorder_as_webcam.pdfIn PDF document text
    • http://jikokajogov.rf.gd/linanepezu.pdfIn PDF document text
    • http://wubalele.rf.gd/ammyy_admin_3._5.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 5176 bytes
SHA-256: 0d27d06b73029f5a37f864e5ccbd64ab9efcd675f9c1a99e4c578e7d1c4a52a2
font_01_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 10416 bytes
SHA-256: b95bbdf569574e9b4ef19dbc1cb311cd5ec28e4c1467720fd0f8134dfe446194