Malicious PDF — malware analysis report

Static analysis result for SHA-256 535d6073e0cdec5f…

MALICIOUS

PDF

73.1 KB Created: 2021-02-25 14:48:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: a5ce898ae035441cb6e705e5a7cf8ade SHA-1: 4aaf65fdec4a005afe224c81e076d54f31f917c0 SHA-256: 535d6073e0cdec5f6d88ae1b23e3117cdacbe85440add23133441375923fdcb4
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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.
  • 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/award?keyword=the+ransom+of+red+chief+worksheet+answers In PDF document text
    • https://busonuvawariba.weebly.com/uploads/1/3/4/3/134355681/zatogajekosa.pdfIn PDF document text
    • https://xulasimij.weebly.com/uploads/1/3/2/8/132814518/6828509.pdfIn PDF document text
    • https://cdn.sqhk.co/jifegusewe/TVchbt7/36173602554.pdfIn PDF document text
    • https://cdn.sqhk.co/xinovupu/SNdZSnI/logo_nasa_herbal_png.pdfIn PDF document text
    • https://cdn.sqhk.co/kerosumumato/jhUja8V/2017-_18_topps_champions_league_chrome.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/pAR6gfB/7717432873.pdfIn PDF document text
    • https://cdn.sqhk.co/xugavizira/fgfhajb/tractor_pulling_events_2020_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/iaIghWV/sipis.pdfIn PDF document text
    • https://cdn.sqhk.co/xipapotug/iageijS/93709377362.pdfIn PDF document text
    • https://bamigifumu.weebly.com/uploads/1/3/4/4/134443618/gejeduzo-gozimuzi-sopamo-pozixugopimumus.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/tjdhfhg/21021223456.pdfIn PDF document text
    • https://sazezikamujut.weebly.com/uploads/1/3/1/4/131438312/6247528.pdfIn PDF document text
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/520b1.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/novifamigot/moving_wallpaper_for_android_horror.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/billiards_city_mod_apk_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/fizafad.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_off0000e291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE291 5336 bytes
SHA-256: 9b67992fbb54ff4db7a298001656650ce9bdb68a13ca30b1e1b4e71d4c4ecb6c
font_01_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 10156 bytes
SHA-256: 2ba25b8569c580f8184663046a12f3d20364d0d89341627fc061d5c52f348472

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