Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9d2e60e4b4be3e…

MALICIOUS

PDF

82.0 KB Created: 2021-04-07 08:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0d04380acc0b9cdf85604554429cf32e SHA-1: b18c51f344e6d48cd1f35ce846976b068ab6d40a SHA-256: ab9d2e60e4b4be3e5cac3db7cf3b6d4fc91faee167cc0283d2833c9e5cc895cb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant portion pointing to disposable hosting and link farms, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or trojan distribution attempt. The presence of external URIs and link farm heuristics points towards the document's primary function being to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://vilenefex.ru/123?utm_term=ikaw+at+ako+piano+chords+sheet PDF link annotation
    • http://rezokaxibipoj.22web.org/54630856127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385026/normal_6011527fe3b43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380078/normal_6021c394cfe8e.pdfIn PDF document text
    • http://ludshop.xyz/knex_instructions_step_by_step3kamv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386079/normal_600f11015212e.pdfIn PDF document text
    • http://alcexpress3.xyz/44303019849xavol.pdfIn PDF document text
    • http://afracheat2.xyz/15443459121h60uo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_60605eff44e02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459805/normal_5ff7a37abb947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_60367c2cdb252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390323/normal_6043ea6932eef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nilikimapineti.epizy.com/asme_y14._5m_1994_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/pabuwixazederinotuxane.pdfIn PDF document text
    • http://jatodilo.epizy.com/wegakesinijan.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/xemekidogoles.pdfIn PDF document text
    • http://lavavoju.rf.gd/72181569898.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/old_man_dancing_meme_template.pdfIn PDF document text
    • http://sejabodareluf.epizy.com/jadid.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/impulse_buying_questionnaire.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/el_vendedor_ms_grande_del_mundo_parte_2_resumen_por_captulos.pdfIn PDF document text
    • http://vibejasejejake.epizy.com/56065551907.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_off00010196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 5220 bytes
SHA-256: 2b2ebb000bf1c042fe4a9df2fb46e0668ff875c68e52bca7612d718cad826304
font_01_sfnt_off00011366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11366 11868 bytes
SHA-256: 0c7121bd3b52fc95e2ac1e7d9bf52a934bd3a6378fa5c076e9df57024a12965e

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