Malicious PDF — malware analysis report

Static analysis result for SHA-256 503aa2354068baec…

MALICIOUS

PDF

75.8 KB Created: 2021-02-01 08:23:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f0f15df883cfa7fc4f99aae9fcb412b1 SHA-1: 3cce15b1298e59aee4fdd786f2fab049e3d684f2 SHA-256: 503aa2354068baec3ecf3bbbd6af3f411119666da0e36c70c0d1f4495e64b450
134 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and heuristics indicate it functions as a link farm, directing users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though partially corrupted, suggests a lure related to educational worksheets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=emotions+and+feelings+worksheets+for+preschoolers PDF link annotation
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/piteji.pdfIn PDF document text
    • https://zevofukuje.weebly.com/uploads/1/3/4/5/134585027/9b1c2a05856d162.pdfIn PDF document text
    • http://damodudajipofem.22web.org/android_graphql_query_builder.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383692/normal_6008fd4e8c7a4.pdfIn PDF document text
    • http://zikuwojanubeg.iblogger.org/ielts_essay_writing_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451231/normal_600be94c1337c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453720/normal_5fcb66cf776d2.pdfIn PDF document text
    • https://bojibelatos.weebly.com/uploads/1/3/4/0/134040608/0e53b5.pdfIn PDF document text
    • http://dunizajo.66ghz.com/superhero_clipart_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wukefomirufiza.rf.gd/905709751.pdfIn PDF document text
    • http://mijikabetabup.rf.gd/uniformity_of_nature_meaning_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/kuranolegigitezimakigawox.pdfIn PDF document text
    • http://xepadegi.epizy.com/71997301502.pdfIn PDF document text
    • http://wufuxoponuwuros.epizy.com/55837005342.pdfIn PDF document text
    • http://kudugumokob.epizy.com/bard_of_blood_netflix_web_series.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/dark_souls_2_guide.pdfIn PDF document text
    • http://fopagozijudiri.epizy.com/aflatoxinas_en_leche.pdfIn PDF document text
    • http://fumibomi.epizy.com/charlie_wilson_s_war_movie.pdfIn PDF document text
    • http://wekujugom.epizy.com/android_phone_factory_reset_code.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_off0000ea2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 5680 bytes
SHA-256: 7142131f37785cfdc7a4e87a2891276cab97d06d5878a8e33e83429d054b40df
font_01_sfnt_off0000fd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD78 10584 bytes
SHA-256: 7893eadfc5b7240a01aeac0832437a6623a437adcd098cbc3507e1414ab9f2fd

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