Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdc16ede29e16b0…

MALICIOUS

PDF

70.7 KB Created: 2021-03-23 23:29:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b36e1252c67b7c00ecbb03d994e08eee SHA-1: 9ae8455649a663b460a253648b8bd3b02654591f SHA-256: ecdc16ede29e16b083ebdd979ee871ae1055836a167cad4946134fae2ad01816
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=how+soil+forms+worksheet
    • https://cdn.sqhk.co/fapiwejagiz/aT52dYV/blade_crafter_2_apk_mod.pdf
    • http://bifozitixexidad.mygamesonline.org/41308967248.pdf
    • https://cdn.sqhk.co/lerapuraroke/jbihdjj/at_t_u-_verse_mcafee.pdf
    • https://cdn.sqhk.co/vukupamita/wEgidTc/mekobukudoxofa.pdf
    • https://cdn.sqhk.co/genopeno/gfhdhes/pitbull_dog_puppy_price_in_punjab.pdf
    • https://cdn.sqhk.co/bubiwalifeda/hjifjbY/zofegifunupodisunaker.pdf
    • https://cdn.sqhk.co/merabuvi/jjjiahi/11387329249.pdf
    • http://nijaxubazaziw.mypressonline.com/84804137762.pdf
    • https://cdn.sqhk.co/mivadunoxo/hb97ja0/watch_the_bachelorette_online_project_free_tv.pdf
    • https://cdn.sqhk.co/xeloxilava/7hjjdN9/keziwipukumavalobaja.pdf
    • http://melofuwi.getenjoyment.net/balanopostitis_manejo.pdf
    • http://mavigawika.scienceontheweb.net/43454170837.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_60a37390d74b47c6bc366283f7e4343b.pdf?index=true
    • http://sumidemeg.epizy.com/78338980379.pdf
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_563ac53796af40248c27f3943358677e.pdf?index=true
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_f79081ce34c44745804f694cbb0add08.pdf?index=true
    • http://noxikemudenuma.epizy.com/debt_settlement_letter_templates_free.pdf
    • https://uploads.strikinglycdn.com/files/1092d713-336f-4cc3-aeae-3cbfa640c37a/cartoon_pictures_of_gears.pdf
    • https://uploads.strikinglycdn.com/files/03f125f1-387f-484f-adb2-6cf87b474197/cloudy_with_achance_of_meatballs_cop_meme.pdf
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_3cc91e7b0f4a48c283ead4f022f51b00.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d78c.bin
02fa01b0b772b82b5da5659520e5534c9f9d913c62e2a7a6c038e85334304eff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 4916 bytes
font_01_sfnt_off0000e827.bin
6615752efd77ff48f2034a59a91c65f3e6592b995ea240d36ffb93e92669d71d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE827 10532 bytes

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