Malicious PDF — malware analysis report

Static analysis result for SHA-256 815848d3600c2d0b…

MALICIOUS

PDF

77.4 KB Created: 2021-02-20 21:55:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6c64fc72da573d72e9d71fbc7e3128d9 SHA-1: 1498a5c2b8ef862bd9be19b5b787c77596c43b21 SHA-256: 815848d3600c2d0b81c6f16e471f0d8fd8ffcaeddbbedc2d78dfc799a1422c8d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a malicious site for credential harvesting or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

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://jottigo.ru/strik?utm_term=krups+beertender+b90+price PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467586/normal_5fe58bd0c1a31.pdfIn PDF document text
    • http://fotobaruti.22web.org/rirekanojimomum.pdfIn PDF document text
    • http://tuzazigigub.iblogger.org/cs_lewis_the_problem_of_pain_audiobook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472503/normal_5fd79e92be24a.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/jgyVPw2/three_kingdoms_global_war_best_heroes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417815/normal_600e791348f45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473902/normal_5fedcc37800ad.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/jgAhh1z/tor_browser_apple_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zixemoliz/ZchsFjr/premier_league_top_scorer_20_21_odds.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tununik.epizy.com/12929373053.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/dakozegujafobexikakepu.pdfIn PDF document text
    • http://vizulubafaxal.epizy.com/lapixiti.pdfIn PDF document text
    • http://puretuwedeva.epizy.com/37476350645.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/oracle_11g_installation_guide_for_redhat_linux.pdfIn PDF document text
    • http://dolipefutulej.epizy.com/akshara_song_badhai_ho_badhai.pdfIn PDF document text
    • http://vopapatadape.epizy.com/xifipubuvupixivapusutojur.pdfIn PDF document text
    • http://kewoxorewozox.rf.gd/junaxezexukinodewope.pdfIn PDF document text
    • http://kotutuvotijol.rf.gd/39613010347.pdfIn PDF document text
    • http://maguzudag.epizy.com/blunted_on_reality_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/franchise_marketing_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE447 5004 bytes
SHA-256: b2e36fcd203b8e3aa40a02922927f11102c4c214b49f5af6fdf10ec5b793e097
font_01_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 10752 bytes
SHA-256: e0728baf5bd73f70a5daa8914eddaea462e60ca4ffe267abe9b85da074ad3c3f
font_02_sfnt_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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