Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c475c57a3c0e22…

MALICIOUS

PDF

78.7 KB Created: 2021-02-15 20:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e5194cf5a3d8d95573c4cfedbbcf4268 SHA-1: 489e36f67b833639e17c0f855d401697af6343e9 SHA-256: 27c475c57a3c0e22ee5589cdcc6abf035fef0066465dc9a54e12d76f456de8bd
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure or a downloader for further malicious 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 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/123?utm_term=what+are+the+22+marvel+movies+in+chronological+order PDF link annotation
    • http://nawilojobate.iblogger.org/21220300887.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459785/normal_5fef6057b64f8.pdfIn PDF document text
    • http://zipogagu.iblogger.org/new_hollywood_movies_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380882/normal_5fe00ccc25b9c.pdfIn PDF document text
    • http://italiabeach.space/sinazazarumezedag0vu6d.pdfIn PDF document text
    • http://bizelapeto.iblogger.org/zerosiwokutowija.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480750/normal_5fe33d0aa9e90.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
    • https://s3.amazonaws.com/bisegilupuf/utorrent_free_for_iphone.pdfIn PDF document text
    • http://romisov.epizy.com/executive_summary_sample_business_report.pdfIn PDF document text
    • http://juwoluvu.epizy.com/5603670419.pdfIn PDF document text
    • http://pubitawiwinas.rf.gd/15253993894.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/blair_singer_little_voice_mastery.pdfIn PDF document text
    • http://nunozufivov.epizy.com/opera_mini_browser_java_app.pdfIn PDF document text
    • http://rupijelovugibiz.rf.gd/brief_answers_to_the_big_questions.pdfIn PDF document text
    • http://mizozibobekujul.rf.gd/mugenivolorij.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_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 5344 bytes
SHA-256: b8f8a952cfc4181bae4ea5c6187d4130035848d4a358abcffe4fa821fa14a56a
font_01_sfnt_off0000f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 11148 bytes
SHA-256: 105b63d98786875eead773459e6a390495b2d7f81f2918ffb51fedb3bd86c3cd
font_02_sfnt_off00011f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F46 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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