Malicious PDF — malware analysis report

Static analysis result for SHA-256 738cb1b99bbdf9eb…

MALICIOUS

PDF

74.2 KB Created: 2021-03-27 23:37:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1afae567eee0b67b07564e6287edb5f9 SHA-1: e9556125921f05f8d1d08b6c0fbe19e6b3261bd8 SHA-256: 738cb1b99bbdf9eb893bd850b55adebd0ee0ccac420febe02ff2519a807c4d58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites, potentially for credential harvesting or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://midufefew.ru/strik?utm_term=introductory+econometrics+for+finance+solutions+chapter+6 PDF link annotation
    • https://zofenegug.weebly.com/uploads/1/3/1/6/131636866/556d4da48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471946/normal_601f952279c45.pdfIn PDF document text
    • https://neripekotijoba.weebly.com/uploads/1/3/2/6/132681370/ba1d3258f514.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413236/normal_5ff26aba2e27f.pdfIn PDF document text
    • https://mefuwowenapes.weebly.com/uploads/1/3/4/6/134611128/titavixaxevof_doviduna_vamupevulib_miduxawujamadik.pdfIn PDF document text
    • http://kesisofawa.mygamesonline.org/what_diameter_is_a_224_valkyrie_bullet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410000/normal_5fdc129db1231.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/53f6c6c0-6e54-433a-ae62-083065b98a75/mom__me__mom_by_maya_angelou_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/50041590070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c7edd58-757a-4b2f-a69d-26b6ad80b2d7/31416527799.pdfIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/come_on_eileen_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/xerumubixekuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72b45d79-4cda-47f0-b4a9-9aa49ea502ca/what_are_the_north_carolina_professional_teaching_standards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e7d817d-c6a1-4fc1-8910-18055f92ce65/murachs_android_programming_2nd_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/castle_bromwich_junior_school_uniform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/784671a2-168b-4145-95f5-af5c4f9f7a5b/webasto_diesel_heater_repairs.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/subatoxunimagipuv.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/dslr_camera_blur_effects_premium_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/8428421523.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/9360664594.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/34235922984.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_off0000e2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 5588 bytes
SHA-256: 933dd58d346c54c414a19f036e3be5d22a48b2668acc94b3c0f5e33fc5365f8c
font_01_sfnt_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 11068 bytes
SHA-256: 76e5353969baf21cbba0dd89a79352daf755df06479cde3fc58678d23da0a313

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