Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2bdbb51aab15665…

MALICIOUS

PDF

76.9 KB Created: 2021-03-11 06:09:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e5366b34e3927fdc06aad20d724e582e SHA-1: 30c57437b766561d1f621fe85775d032e3926595 SHA-256: a2bdbb51aab15665bd8a36966ea7e0fd77524c11447eb1e3c529f21693f4ffe9
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 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/award?keyword=symmetry+worksheets+grade+1+pdf PDF link annotation
    • http://fakixigulidol.mywebcommunity.org/john_medina_brain_rules_fr_ihr_baby.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/how_to_deal_with_presentation_anxiety.pdfIn PDF document text
    • http://vuvuga.xyz/gibebatexixizadavoziiu3v0.pdfIn PDF document text
    • http://bipowilago.mywebcommunity.org/65488552578.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/adaptive_features_of_xerophytes_and_hydrophytes.pdfIn PDF document text
    • http://myluckywin.site/sufuges24f9.pdfIn PDF document text
    • http://deutschebank-meine.com/jopazumopomesujamu00r31.pdfIn PDF document text
    • http://rezonansmusic.com/tadawobimetepowilub72gvm.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/j5gi8NQ/find_elder_scroll_dragon_skyrim.pdfIn PDF document text
    • https://cdn.sqhk.co/luvunugoz/0hjjjhf/72160091843.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/rudif.pdfIn PDF document text
    • https://cdn.sqhk.co/bobofibu/jjjaShb/43627804611.pdfIn PDF document text
    • http://gapijet.scienceontheweb.net/algorithms_and_complexity_wilf.pdfIn PDF document text
    • http://gavediteriremuv.medianewsonline.com/3479871416.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/kiwanisaje.pdfIn PDF document text
    • http://big-ita.space/toguj32o5m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/chhichhore_movie_songs_webmusic.pdfIn PDF document text
    • http://vugugemo.atwebpages.com/acer_aspire_e_15_e5-575-33bm_price_in_pakistan.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/como_fazer_o_bebe_parar_de_chorar.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/how_to_change_battery_in_playstation_controller.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/pizadobototajovukapaxa.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/febazetafo.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/galupoxubelufabegener.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_off0000ebc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC0 5836 bytes
SHA-256: 5d402cd17edb833414a0af91d5a91488e647994fbe15b70064a6e8b9a47f5992
font_01_sfnt_off0000ff96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 11968 bytes
SHA-256: de19345808367ccb63a77975a683b9bfc48077024e7a7d6f66478a78297b67d1

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