Malicious PDF — malware analysis report

Static analysis result for SHA-256 716fbb826b025074…

MALICIOUS

PDF

104.5 KB Created: 2021-02-28 22:24:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fece005acc1ec4bd22044e6da857ebe1 SHA-1: b1f3ba4d14ee3403f8a50d29f1e9f5e709f66e4c SHA-256: 716fbb826b02507453c5c641cb0161cdf10d8f3f54fbc31158238959837a0a47
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9994

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=anecdotal+observation+in+childcare+example PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4529087/normal_600ff51a6ef69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491437/normal_603346d88fde5.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/73223828783.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413845/normal_6003ae00b5011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483854/normal_602f0bedce92b.pdfIn PDF document text
    • http://betabudon.iblogger.org/68093369674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_600c6b58dc76c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448540/normal_5ffcb3ac3d5de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384046/normal_5fc71a8293f6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377656/normal_5fc9166834bf5.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/bakitevirivowisa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387428/normal_60316c21c82d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498801/normal_6029c75f0c616.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/best_books_for_gmat_preparation_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378608/normal_5ffa4e347479d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/ridimejazebominikos.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/57957153845.pdfIn PDF document text
    • http://vudemiziwifimo.epizy.com/16937672045.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/mibabejovawewekela.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/50112448265.pdfIn PDF document text
    • http://tereralubo.epizy.com/flight_of_bumblebee_piano_sheet_free.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4C 5360 bytes
SHA-256: 421e764583e2d285621e29ced9ff9299311b56a99f5e5b093d3cf7813375738f
font_01_sfnt_off00014c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C12 1392 bytes
SHA-256: 5939902bd6f658a20793d578392ac111d026b08840b9639da9bd98605d9129d1
font_02_sfnt_off000153a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A4 2516 bytes
SHA-256: 536d13d570f903d510f74cc78fe9ad97b6e78ff401c07879087f9e315cbcdb52
font_03_sfnt_off00015e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E7E 11496 bytes
SHA-256: b40c451f2044a0c359230f3ed5e65727ee17e78de9f863a96f08a60af74057f7
font_04_sfnt_off0001850a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1850A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378