Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da8ba2f068d9311…

MALICIOUS

PDF

76.4 KB Created: 2021-02-14 10:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: ec94dbc6680e8e17b28d79acf8ef088c SHA-1: 364e83ad2e0d25839332d26ca7b09f4c63f31eb0 SHA-256: 8da8ba2f068d9311886566c13a6b011e4d51463a8904d1d551b8ff4f6b343efa
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/aws?utm_term=science+olympiad+heredity+study+guide PDF link annotation
    • https://xupusunozad.weebly.com/uploads/1/3/1/0/131070799/fevawofa.pdfIn PDF document text
    • https://nerapusu.weebly.com/uploads/1/3/1/4/131438180/notujoni.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/iih5xVv/28754581857.pdfIn PDF document text
    • http://palitra-cveta.ru/rikusew5e6f.pdfIn PDF document text
    • https://cdn.sqhk.co/dexasubu/wijgchh/96351343859.pdfIn PDF document text
    • https://cdn.sqhk.co/webepinovet/ijiahcm/nemavatejulizipor.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/aOghmzM/cute_boo_monsters_inc_gif.pdfIn PDF document text
    • http://tutulobos.22web.org/zejevuvazuwika.pdfIn PDF document text
    • https://gefaturulabi.weebly.com/uploads/1/3/4/4/134487578/103c04c3.pdfIn PDF document text
    • https://bifukumuvu.weebly.com/uploads/1/3/5/3/135347201/fapizezovema.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/xijuxosisomuna/54196709827.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/maxafanuzixev.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/beedi_scholarship_application_form.pdfIn PDF document text
    • http://divojeniro.epizy.com/taxipoluzipuduxadera.pdfIn PDF document text
    • http://bibuligo.epizy.com/manualidades_para_ensear_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/at_t_u_verse_channel_guide_milwaukee.pdfIn PDF document text
    • http://gewofudi.rf.gd/admission_guide_book_2019_20.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/85065755370.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_off0000ed06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 5692 bytes
SHA-256: 0144c4c17d15d805c6336d51ec23e44b8f9144bce366600f40acff65dd4509b1
font_01_sfnt_off0001003e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003E 10716 bytes
SHA-256: 64642c2366dae5588af8abe0c4a40f472d236053b32b03b18d15aba68febe2b7