Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4de428469e593e4…

MALICIOUS

PDF

76.5 KB Created: 2021-04-08 18:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9e4ce309986127327aac62b90b2501dd SHA-1: ea477a9acc7f5f7eef9252f85430d65cc9c09a37 SHA-256: f4de428469e593e4491476edee41b1086ca7e2e4ef526e6c5306db3bd2f2684e
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 0.9991

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://ponafet.ru/strik?utm_term=how+to+be+a+captain+in+volleyball PDF link annotation
    • http://cucoupon.info/zikosedazodimovinavonililgngw.pdfIn PDF document text
    • http://physcoo.com/why_is_macbeth_curse_in_theater1u7p5.pdfIn PDF document text
    • http://passive-income.ru/control_systems_engineer_jobs_in_san_diegokf7fu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478664/normal_60142e12c345e.pdfIn PDF document text
    • http://evakuator-uga.ru/lilibinokuxuvubufedzl80r.pdfIn PDF document text
    • https://xikipavukageza.weebly.com/uploads/1/3/0/7/130776529/aa2a23c.pdfIn PDF document text
    • http://topcreditreport.info/34385858644kf796.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372101/normal_5fc580c8e63f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477164/normal_5ff133e442c0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_603892c26fb08.pdfIn PDF document text
    • https://xoberaditide.weebly.com/uploads/1/3/4/6/134645794/vifixozaba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_150ae0d8137746529d7e506894c60b29.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wofaxil/24410706456.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/56349326981.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/livetamebaz.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/c_programming_book_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/winkawaks_emulator_and_roms.pdfIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_c659415ad15b45b4b048501cfe770450.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tezude/vudupitugemenokobodij.pdfIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_12b5df1e4e9947ea82de99565af3e745.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/varoximu/math_coloring_worksheets_4th_grade_multiplication.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/50879523098.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/bed_sheets_amazon_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/92102709044.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_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 5008 bytes
SHA-256: 3d0c0a219f21acb3e180d22a31e73cf6a62d495c6cd8db554b450f3fc4473d8f
font_01_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 10412 bytes
SHA-256: 596656332c081dfc05fc2f16a76268a25b57b731a0707cd6d132c2f8def8eb64

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