Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8cb281983ad1a0…

MALICIOUS

PDF

81.1 KB Created: 2021-04-19 11:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2390a15ca4bed7f870b9c5088a9e68c1 SHA-1: 8c1cdeb9df569d1e07e5e69614df77715cbedd10 SHA-256: 1a8cb281983ad1a01ae2322a2034eaa5ababec73e161a05bde815c35c0f31386
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 embedded URLs and heuristics indicate it is a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to 'transmission shifting problem' to lure victims.

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://seumenha.ru/strik?utm_term=how+to+fix+transmission+shifting+problem PDF link annotation
    • http://gadatoreneperil.mygamesonline.org/administrao_pblica_concursos.pdfIn PDF document text
    • http://adminhalil.com/nupotm5wzv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413563/normal_5ff8939ca5eab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404299/normal_5fd8ccaa99f12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465269/normal_5fc8521de093b.pdfIn PDF document text
    • http://ginalupajeriw.scienceontheweb.net/jeevan_labh_brochure.pdfIn PDF document text
    • http://marinarus.space/scag_tiger_cat_2_61_kawasaki_enginefbglu.pdfIn PDF document text
    • http://mivegik.mygamesonline.org/barney_stinson_books_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444636/normal_606d34133abb6.pdfIn PDF document text
    • http://fruittea.space/5085171281jdlvf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416514/normal_6065c24bb04fb.pdfIn PDF document text
    • http://wugafis.66ghz.com/grade_8_english_curriculum_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mupopab.rf.gd/nowuzojo.pdfIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_0394fbf2076947dd97db40cae82e9637.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_044e0cfca62b4120bd5b20319596c6d0.pdf?index=trueIn PDF document text
    • http://fijorolur.myartsonline.com/aflac_short_term_disability.pdfIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_057c556dff624c6b8447268c9eba6ca6.pdf?index=trueIn PDF document text
    • http://susijul.rf.gd/ohio_high_school_fastpitch_softball_rules.pdfIn PDF document text
    • http://niwimugosaz.onlinewebshop.net/airnet_piping.pdfIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_3107e9f92be74f93b1dd29abca12a2ca.pdf?index=trueIn 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_off0000fe7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 5576 bytes
SHA-256: 2dc243382488acf4f9d972bba249dc256b4f6eb6b1733eed0e13214bb8e6a02d
font_01_sfnt_off0001115d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 11316 bytes
SHA-256: 4eb478859d9601d0b8a355dfb5585b15159e4353dc777fb6a63ef0a3dce26497

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