Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03a6b19693fc44a…

MALICIOUS

PDF

76.3 KB Created: 2021-03-23 17:29:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c7048f77d0484eac72179db59ee55fea SHA-1: 93e65d9d5ef1669c81c1198c5f33c0358865a294 SHA-256: e03a6b19693fc44a44932babd6b93af15e6d689eeadef1c7e27ef11ed4386cf8
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains multiple embedded URLs, with a primary focus on `https://vilenefex.ru/award?keyword=factores+psicologicos+en+la+adolescencia+pdf` and `http://theplafond.xyz/wamileg7d5a9.pdf`. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of external URIs and the overall malicious verdict strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/award?keyword=factores+psicologicos+en+la+adolescencia+pdf PDF link annotation
    • http://theplafond.xyz/wamileg7d5a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390366/normal_5fe884047d724.pdfIn PDF document text
    • http://mixutadumekaje.mypressonline.com/64010318872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_5fd724b6e461f.pdfIn PDF document text
    • http://resokipuga.getenjoyment.net/connected_speech_exercises.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/superstition_sheet_music_guitargbcx8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476148/normal_5feb3e902e84f.pdfIn PDF document text
    • http://metikinave.22web.org/blooming_days_album.pdfIn PDF document text
    • http://brumbum6.xyz/gosebobavijotadivapezedokqepj3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_6013c5980dc50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464709/normal_6054502831086.pdfIn PDF document text
    • http://rezokivi.medianewsonline.com/80401311376.pdfIn PDF document text
    • http://thedouche.xyz/864284316718ndx6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jidoxib.rf.gd/37254804395.pdfIn PDF document text
    • http://retudazugo.rf.gd/rodexurafanoduseb.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/toastmasters_general_evaluator_report_form.pdfIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_41375c3db6fb498d9dcb715de366d44d.pdf?index=trueIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_b9612bc3c96848d48ba62a34c8c3fbd6.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_4c059c8fad3e4425909663ce6ed10819.pdf?index=trueIn PDF document text
    • http://lezebotetojezaz.epizy.com/parliamentary_system_vs_presidential_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aecf684-6ea9-4619-a5f2-f932acc10ff4/54099901219.pdfIn PDF document text
    • http://pakemeza.epizy.com/formal_letter_with_greetings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22a3860-5e69-4d16-8f70-877d1d7e516b/2005_dodge_ram_1500_4.7_engine_towing_capacity.pdfIn PDF document text
    • https://c1ab63b4-4781-4901-abeb-f581ed41d26f.filesusr.com/ugd/b44917_d8147aa393e549408b845028172d5b74.pdf?index=trueIn 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_off0000e9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 5276 bytes
SHA-256: 27a43629c5ce1581385ead132471c9ae6b21bd378c54d4c6f22dcde13c5d4d23
font_01_sfnt_off0000fbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEC 11488 bytes
SHA-256: 080ce6abeecd2a394786095b6e597713e9d16fb4f9b7de5f889d4b6cef676c0a