Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab8438ea5b817a4…

MALICIOUS

PDF

79.7 KB Created: 2021-06-01 11:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 633d1d86c9c4c07deb91e45b180e661a SHA-1: ca8648bc528bc6d837d5e73b97504b760597e4e1 SHA-256: 7ab8438ea5b817a4502c4489d8bfa16166d83f13b647c80d352397525f8262c8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicative of a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/123?utm_term=bracket+leaders+of+tomorrow+music PDF link annotation
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/vamexesanuverab_jaxaxawirerub.pdfIn PDF document text
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/3b142848759c0.pdfIn PDF document text
    • https://zuzowasef.weebly.com/uploads/1/3/4/3/134351381/danoxe_poseveropej_petagikib_kusave.pdfIn PDF document text
    • https://lixemuvoxowogod.weebly.com/uploads/1/3/4/8/134878154/kijapol.pdfIn PDF document text
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/venoberufun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461786/normal_5fddb2f1c3236.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469106/normal_5ff9fab40223b.pdfIn PDF document text
    • https://letenotej.weebly.com/uploads/1/3/4/5/134595585/nutozuxogudiko-xatixuzojoker-vexiwopumok-puxew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410027/normal_60097a33718f8.pdfIn PDF document text
    • https://nefipuximejax.weebly.com/uploads/1/3/2/6/132696351/93ca5.pdfIn PDF document text
    • https://wezawemexa.weebly.com/uploads/1/3/1/4/131410399/lipizubopojinu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417214/normal_6034fc558be99.pdfIn PDF document text
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/tozima_ramugajevaki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372383/normal_5fdf2d1f0b45f.pdfIn PDF document text
    • https://nawiveburejofi.weebly.com/uploads/1/3/1/3/131381882/nejinofolomumi-dizijifa-lepowa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lekuzax.pbworks.com/f/fojevekemetenusurideko.pdfIn PDF document text
    • http://wefolevemud.pbworks.com/f/as_etapas_do_pensamento_sociolgico_karl_marx.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 5372 bytes
SHA-256: 3658ce8a53b782834639d28aa0cfef8d77f423546419e408e94c1e8899c3214f
font_01_sfnt_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 11900 bytes
SHA-256: 247cbe01ef4d6eb5b1eb0407fda1d3b558245f0af31fbde4990aab93ccfaab2d
font_02_sfnt_off00011cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAC 16096 bytes
SHA-256: 9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61

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