Malicious PDF — malware analysis report

Static analysis result for SHA-256 81613cd72d55732e…

MALICIOUS

PDF

72.1 KB Created: 2021-02-10 20:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 1fd51615eec4846a8b7172747b25dcf5 SHA-1: 7732c1bfa14436cafecb3619e8bc515fdf204523 SHA-256: 81613cd72d55732e26cd6ddd1f918a90d11c97966d1115d6eff801f5a090ed9e
144 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/aws?utm_term=coloring+sheets+printable+letter+h PDF link annotation
    • http://gnfcns.info/pbisworld._com_check-_in-_check-_out_forme0j0k.pdfIn PDF document text
    • https://cdn.sqhk.co/jofutagi/dRjcheW/nutatibotavolewi.pdfIn PDF document text
    • http://fredo.bike/ragadapomog33wz.pdfIn PDF document text
    • https://cdn.sqhk.co/nenakowi/9w7JQxW/line_rider_3_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445558/normal_5fd171502e037.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/s75jf8L/84207720260.pdfIn PDF document text
    • https://cdn.sqhk.co/vixawutozama/AZ2Umhg/binum.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/gdjjfNH/rolonadupugupa.pdfIn PDF document text
    • https://cdn.sqhk.co/bukoxomule/icA7RYD/hotword_changer_for_assistant_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/lazuxorus/jafiggi/playstation_network_support_refund.pdfIn PDF document text
    • http://card2card-perevod24.site/74411912072va5ig.pdfIn PDF document text
    • https://cdn.sqhk.co/talexadu/hghDgeA/3463495099.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/levumoduf/rolled_candles_beeswax_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/admission_test_natok_song.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/albion_online_android_free.pdfIn PDF document text
    • http://petekukeseji.rf.gd/jinipumokogisonupu.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/asian_cup_2019_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/mariam_khan_reporting_live_full_cast.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_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 5124 bytes
SHA-256: fdcf471e7f9f7a309376933cf98d1d85c7064d99cd3271aec71036c150fb61ea
font_01_sfnt_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 10112 bytes
SHA-256: 8d8ace6530402a7bf4aa97f3c2557e0d5997fcdc065b673b15cc2d769acf411c

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