Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a4fa41081df1d6…

MALICIOUS

PDF

71.3 KB Created: 2021-02-13 01:01:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: fa30466d99a367b09009ddc2a81596c0 SHA-1: bc19bd59292e30291c693f92813e33807777e2f9 SHA-256: 36a4fa41081df1d6afcba97464eaf5b514fb28058b2fad1cc74a9caa8a13b771
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/wix?keyword=meiosis+worksheet+label+the+phases In PDF document text
    • https://cdn-cms.f-static.net/uploads/4489240/normal_5fea3481a3947.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/adjDbja/jumpy_jumpy_helix_ball_free_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_5fe99895842b7.pdfIn PDF document text
    • https://cdn.sqhk.co/bexutavukaro/EzYghhe/sniper_traffic_hunter_apk_android_oyun_club_indir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468286/normal_60199dd704cf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490001/normal_600a920201b9a.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/5ifN6ZK/75385339302.pdfIn PDF document text
    • http://jaxebememapi.iblogger.org/varejilegopegos.pdfIn PDF document text
    • https://cdn.sqhk.co/gejikofoxaf/Oclojc3/cone_ice_cream_machine_for_rent_in_chennai.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/mizeteb/29540441379.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/44111554764.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/30649082632.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/fepure.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/toms_alpargata_platform_white_exclusive_canvas.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/fiwivenituruviwuxosut.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/wojotemesi.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/77888587596.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B0 5208 bytes
SHA-256: d3a13ad0304b3176d8312bc1adb13792005706cbb8b9e28e6f306acb21461f97
font_01_sfnt_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 10036 bytes
SHA-256: 03e7c366f2b6c0399a91508ec216527bd84e0741834598cd73ae78a8f55981f3
font_02_sfnt_off0000fb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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