Malicious PDF — malware analysis report

Static analysis result for SHA-256 39db7483670b3d32…

MALICIOUS

PDF

102.0 KB Created: 2021-02-18 18:42:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ccc6b1bf3a39d210b01e77c80c17d40f SHA-1: 221364863af72cbedeb19407a9992312a463c50b SHA-256: 39db7483670b3d3271fcf019f6e8700d9264f6ad3bb3bd42fbc00924c319a33d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to personal development plans, which is likely a pretext to drive users to these 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://jottigo.ru/123?utm_term=how+to+create+a+personal+development+plan+for+work PDF link annotation
    • http://salonlabs.xyz/52401855685mkjnw.pdfIn PDF document text
    • http://watulexop.iblogger.org/tekemamit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369486/normal_5fc9178228c4d.pdfIn PDF document text
    • http://natikolom.site/learning_spanish_like_crazytqdqq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476453/normal_601e6811229fe.pdfIn PDF document text
    • http://tegor.xyz/9896265578752u5u.pdfIn PDF document text
    • https://damujulul.weebly.com/uploads/1/3/5/3/135335913/1832255.pdfIn PDF document text
    • https://pojuzalik.weebly.com/uploads/1/3/4/2/134235388/4cff9fdd45.pdfIn PDF document text
    • http://magazinrf.xyz/wofonotesah3ryy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406464/normal_602b07ae9d507.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378857/normal_5fdfaa032d804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381344/normal_602b781080fb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408346/normal_5fff24d1a6d65.pdfIn PDF document text
    • https://cdn.sqhk.co/posaleren/gdqvjf4/toilet_games_3d_app_store.pdfIn PDF document text
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/811344.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/fjeejet/petipowajena.pdfIn PDF document text
    • https://xipeluzewuwese.weebly.com/uploads/1/3/1/4/131406434/1592370.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nepejalaziba.rf.gd/79428722053.pdfIn PDF document text
    • http://fujebamezojeli.rf.gd/putugitupasil.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_off00014fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD9 5480 bytes
SHA-256: 68d1773d21d69153ea7ebc36522721987be61df480d1595c812798dfac61bfba
font_01_sfnt_off0001627c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1627C 11652 bytes
SHA-256: d158a0e4c80e616629d02e052bdca5c9ca26add6aa2ad0f5401b1235a28e66bc

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