Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0145e932a3583d…

MALICIOUS

PDF

97.5 KB Created: 2021-03-18 15:10:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 91ad68790708f6a5b1a944af3a7bebbf SHA-1: 9d3c0031838f20cfc03e1f5b5e44d9d5d2f5d880 SHA-256: af0145e932a3583dddca250eb390174a6bd59ad62d4236a8c971d6fc9349de4e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and one specifically identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to 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://gimoguvi.ru/award?keyword=historia+de+los+alimentos+transgenicos+pdf PDF link annotation
    • http://debopuforu.22web.org/nixegobaruvijekinen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_600adfd501de5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419645/normal_604ae6b802b95.pdfIn PDF document text
    • http://jakiduve.scienceontheweb.net/45639504285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416660/normal_600c22dc84ead.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/math_word_problems_2nd_grade_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405202/normal_6006f06e2cb26.pdfIn PDF document text
    • http://pizuwujigajanen.medianewsonline.com/crpc_bare_act_2020.pdfIn PDF document text
    • http://lowusonuraku.mygamesonline.org/sewajeji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466140/normal_60072f115c9c9.pdfIn PDF document text
    • http://kedamijofulufep.mygamesonline.org/xomakedawitevifotureto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://daxevetefixidaj.epizy.com/98222813618.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/free_printable_grade_sheet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/turkish_airlines_miles_and_smiles_feedback_form.pdfIn PDF document text
    • http://zaxisomal.epizy.com/rigasexakedexokalin.pdfIn PDF document text
    • http://magegefopo.atwebpages.com/pusekebu.pdfIn PDF document text
    • http://sojufuka.atwebpages.com/raymond_pallet_jack_owners_manual.pdfIn PDF document text
    • http://kagubosewox.epizy.com/mitazaluxosikofodabeti.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_off00013b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3C 5436 bytes
SHA-256: 837ec4dc8318ddcf9920a36f1bc4a8cc01af093b977df7be9954cac0fd37a393
font_01_sfnt_off00014da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA3 12952 bytes
SHA-256: a71ebad2e539cbcced2577fdcdbea370f5149a3f5b973bb6d6f13c91aca628ce

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