Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f9db119356b1ee…

MALICIOUS

PDF

70.3 KB Created: 2021-02-19 01:01:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: ef311dfeab3521c9b0949551b2907f25 SHA-1: c0e35584310ae406fa131b6017037739aaaf233c SHA-256: e7f9db119356b1eec2b62e79a914048e2a98ec7984d5dff3f9fa79c999523e92
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to disposable hosting and potentially malicious domains, suggesting it functions as a link farm or phishing lure. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

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 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://druttle.ru/wix?keyword=hisense+air+conditioner+manual+pdf PDF link annotation
    • http://salebox.shop/precalculus_mathematics_for_calculus69job.pdfIn PDF document text
    • https://nemelodanunoju.weebly.com/uploads/1/3/0/8/130874480/ad9142bba95e.pdfIn PDF document text
    • http://amst-watch-v2.club/kepipjhlmm.pdfIn PDF document text
    • http://twoup-viktoria.online/mobile_legends_hack_bang_bang_diamonds_cheatsh9rm7.pdfIn PDF document text
    • http://karivometiw.iblogger.org/aggarwal_college_ballabgarh_online_admission_form.pdfIn PDF document text
    • https://cdn.sqhk.co/womilepeba/duSb3By/nunigi.pdfIn PDF document text
    • http://pipvip.ru/zukebesifipinepezhwef.pdfIn PDF document text
    • http://interstart.online/2886896477665nbq.pdfIn PDF document text
    • https://dojibosuxuzepi.weebly.com/uploads/1/3/1/3/131378780/5080573.pdfIn PDF document text
    • https://dakubazelup.weebly.com/uploads/1/3/1/4/131454222/gamesoferixige.pdfIn PDF document text
    • http://sudidukof.22web.org/please_see_below_information_for_your_reference.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/duzexefemosaxe/avast_antivirus_uninstall_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/nojoreputigulesodoze.pdfIn PDF document text
    • http://xelidamos.epizy.com/abstract_mathematics.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/bepugokesutometowipep.pdfIn PDF document text
    • http://kexabomatifub.epizy.com/tg20_compliance_sheet.pdfIn PDF document text
    • http://gijomifede.rf.gd/new_punjabi_badmashi_status.pdfIn PDF document text
    • http://tokofelutuj.epizy.com/90956681182.pdfIn PDF document text
    • http://sevuvev.epizy.com/22519980312.pdfIn PDF document text
    • http://gulaguwiz.rf.gd/category_theory_textbook.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_off0000d80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80D 5260 bytes
SHA-256: 58a700cd66c2e93faf988931a5149ebad4ae9de1fab07a5cccb769993419a3bd
font_01_sfnt_off0000e9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 10092 bytes
SHA-256: adc83618229f72a22fc16d7b609f78cc5e6108bc5b89819bc2f3e098b23aa1fd

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