Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6aff402de1f13e2…

MALICIOUS

PDF

73.7 KB Created: 2021-02-14 12:31:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: c5e1e235f0e21215c14e5e57fd8dab99 SHA-1: a72506f28beeeefd89e2343db3e829fae6a0f0ca SHA-256: a6aff402de1f13e25e666da65fad7c63b63fdd08ef4769f9e4153f0b3eaf5c75
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=air%20force%20chaplain%20corps%20activity%20reporting%20system In PDF document text
    • https://cdn.sqhk.co/fekigimuzib/CjfZpjb/fashion_play_barbie_1987.pdfIn PDF document text
    • https://cdn.sqhk.co/mivufarowiwi/6pgchf0/xozopuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/MVshGjf/dead_fish_eyes_anime.pdfIn PDF document text
    • http://kixisufosudizif.iblogger.org/gorufutapotafabafaw.pdfIn PDF document text
    • https://cdn.sqhk.co/pasezateda/hbrWyhj/the_walking_dead_hd_wallpaper_iphone.pdfIn PDF document text
    • https://vovowiki.weebly.com/uploads/1/3/2/3/132303124/78dc88.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/drRlXEl/72935441198.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/BiaP0jd/valutunow.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/9N1jigb/chickens_with_feathered_feet_uk.pdfIn PDF document text
    • https://gejabadofezeda.weebly.com/uploads/1/3/2/6/132681436/rarumuzenamalul_litovesadofe_kawagotuj.pdfIn PDF document text
    • https://paxepufa.weebly.com/uploads/1/3/4/6/134640660/gowamepuz_kiromereniwux_vofawoviroweb.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/icjdJhi/goxexuvoterala.pdfIn PDF document text
    • https://xogosafaxisomig.weebly.com/uploads/1/3/0/7/130739024/5cd4da.pdfIn PDF document text
    • https://cdn.sqhk.co/rubekafux/jePHiii/jovezerunodo.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/Z2Xbv67/dark_legends_bundle_skins.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/nagudo/philips_ac1215_20_user_manual.pdfIn PDF document text
    • http://tukozadagafewan.rf.gd/bugiviro.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/vsphere_client_5._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_off0000e129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE129 5580 bytes
SHA-256: 6881c86fc75c1225417922a0d934059c8a7d0c79dd9fc4db859d016e50f71f54
font_01_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 11036 bytes
SHA-256: c29b8527e6f6934bdcb6965e6ae0e46a7353ba4897fb2356d5f61cd9742343a3