Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7c04700b6a62d8…

MALICIOUS

PDF

76.7 KB Created: 2021-01-29 14:39:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e5b3980ddd51946f878897b71808c496 SHA-1: def60e9ef8aa0eaf0f19d08292dfc79c95345fdd SHA-256: ba7c04700b6a62d8c948067bf4aa6b516abc5aa4c7053d7960027ee085aaa063
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically flagged as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded content, though partially obfuscated, point towards an attempt to exploit users by directing them to potentially harmful external 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://maypoin.ru/123?utm_term=bile+esculin+agar+slant PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381752/normal_60001688d9e35.pdfIn PDF document text
    • http://reduslim-officialsite.site/knights_of_columbus_sword_price7xn3z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470408/normal_5fca9c03cfe2f.pdfIn PDF document text
    • http://markettop.pro/civil_service_answer_sheet_samplegr0rr.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/jjRgcig/cloud_bread_keto.pdfIn PDF document text
    • http://about-fb-support.com/jetuwevaxixovumoveverazalmh8ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426955/normal_5ff59c458a0ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481056/normal_5fe9855e6cbfd.pdfIn PDF document text
    • http://karnaval.host/xfinity_prepaid_internet_not_connectingtc1b1.pdfIn PDF document text
    • http://baugroup.info/nakujujonetoz9ljf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485457/normal_5ffa69417b64c.pdfIn PDF document text
    • http://hookup666.site/hitch_ball_cover_autozone6cqoo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375522/normal_6009d8b3c9d54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373997/normal_5ff50e704d3f3.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/chehbS7/dizetevugasosevit.pdfIn PDF document text
    • https://cdn.sqhk.co/kamozipu/ifgi0Zk/foduk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sezewu/savumikonumop.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/57921204631.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/palilobakujumawodo.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_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 5016 bytes
SHA-256: 38f7268488e6c80da27ed6f3d5c980816a86c9188d97c8ec7aefc1d645b2116b
font_01_sfnt_off0000fe83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE83 11860 bytes
SHA-256: 18fb522a1c2bb4ae315eef8645b0e2a05fdcdc0bd70fce15d798770d6a5c8edb

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