Malicious PDF — malware analysis report

Static analysis result for SHA-256 31371dd007062215…

MALICIOUS

PDF

76.5 KB Created: 2021-03-22 10:40:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e77119f13c04316dc87d6adb7173502c SHA-1: fd41b1f977e67ddfa708ec788d1303ac29401c00 SHA-256: 31371dd007062215837be11560590adaa25fb6d95824af6dfb5b02e19aded026
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/aws?utm_term=bersa+380+custom+grips PDF link annotation
    • https://cdn.sqhk.co/nasubivapu/Dje3Mie/xabami.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491451/normal_5fca58ce43cf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479470/normal_603c48d5e8802.pdfIn PDF document text
    • https://cdn.sqhk.co/lilakeboj/gcEjehe/18102575927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501364/normal_5fd813cc67470.pdfIn PDF document text
    • https://cdn.sqhk.co/xetokive/dTsTjut/disassembly_3d_cracked_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/matajikiwov/jgchcgh/microgolfoven_kopen_solden.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/rotowan/descargar_brawl_stars_hackeado_2019_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/80344715451.pdfIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_3b2ad2c086cb484ab20680e592ce32ab.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_567776c1bc1b4160bb31c28e95ab15cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuwosil/61110868041.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/gafafowizavevop.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/anganwadi_bharti_2019_mp_online_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/asma_pdpi.pdfIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_88434d38739a471aba7d55bb3805ce79.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/bulodujugujukagutubini.pdfIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_a92754bfba714e47b8340929e29f9079.pdf?index=trueIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_3ee187da6d3142e5bc3dae27cecc5010.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/bike_ride_status.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/93716314774.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E8 3088 bytes
SHA-256: a5dfa1cfd2b0e17310fb99632b0a97d9bfc1e8b58bbf32aa010b3f68be88d9a8
font_01_sfnt_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 5772 bytes
SHA-256: 53506eadc9647e1fb928138025f6488bfd6976b306f11049629b8a8b55e95af7
font_02_sfnt_off0000ff6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 10828 bytes
SHA-256: 9cb411f237e92b6392682d24d0f37eceabb261fe91d16b0bb37b83318a0cc199

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