Malicious PDF — malware analysis report

Static analysis result for SHA-256 761d18b255b5a2d6…

MALICIOUS

PDF

71.2 KB Created: 2021-03-04 10:25:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 93d3bd9033720a51ace7cf36f65ee8a0 SHA-1: b762cb023e1f32a78d254b642e0d776fdb3ea74a SHA-256: 761d18b255b5a2d611b32b9e4afc958ca8b8f13d1a82c38ba301296e1d71bfb7
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=new+testament+primary+manual In PDF document text
    • https://static.s123-cdn-static.com/uploads/4470960/normal_6002addb2b8ed.pdfIn PDF document text
    • http://profer-opt.ru/294175659120bkgx.pdfIn PDF document text
    • http://amorexpo.com/stoichiometry_study_guidegl46z.pdfIn PDF document text
    • http://parrrtner.xyz/pokemon_blue_full_color_rommm90f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450907/normal_6000926b2e0f9.pdfIn PDF document text
    • http://creditreportusa.info/26999475732109m1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413374/normal_5fe814b572eaf.pdfIn PDF document text
    • https://gikanusubidi.weebly.com/uploads/1/3/4/7/134756500/e99580fe201.pdfIn PDF document text
    • http://ryduslim.website/13920362399tsmho.pdfIn PDF document text
    • https://patobusogeziwe.weebly.com/uploads/1/3/4/0/134096506/e6374bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474206/normal_600115ac39a50.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/gimisorixosu/new_version_of_whatsapp_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/lusavofujugujuvagineni.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/chimeric_antibody.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/pexesaguvudopixiniliten.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/4705397246.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/ghost_recon_future_soldier_weapon_challenges_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/zidarulaxekomeberasogarip.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/21933229111.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_off0000dc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC47 5128 bytes
SHA-256: a429b5a6f948936756da2f5b04637d19db69e888bf1ec095699030f089172440
font_01_sfnt_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 9908 bytes
SHA-256: 437ce4eb5c624df50dad7a7b880a8e7ae8dc315b61cf69044130c807f6a040de